Guild Info

The two crafted upgrades, as they compare to Spellslinger's Slippers:

Deathfrost Boots:
+29 stam
+28 int
+41 spellpower
+64 hit (probably of no value to you)
+80 crit
(same sockets)
-41 spirit
-56 haste

The 41 spirit that you lose, in addition to some mana regen, is worth about 14 crit rating (or 0.305% crit chance). But the extra intellect on the 264 boots will give you .168% crit chance back, so the 80 crit gain on the better boots is more like, let's say, 74.

So you're comparing 56 haste and a bit of mana regen to 41 spellpower and 74 crit.

That's definitely an upgrade, and if you're having mana issues on any fights, the exchange looks even more attractive (spellpower and crit are "free" damage with respect to your mana pool, unlike haste, which drains resources faster.) I have a hard time seeing that as a 5 or 6 thousand gold upgrade, though.

Sandals of Consecration:

+29 stam
+28 int
+39 spirit
+41 spellpower
+64 crit
+41 spellpower
2 yellow sockets instead of 1 red 1 blue
-56 haste

So you get the same extra tiny bit of crit from the intellect, plus you get another 13 crit or so from from the 39 spirit, plus you get the extra 64 crit rating (16 less than the other 264 boots). So on balance, less crit than the others, but a nice upgrade over your current boots.
You get the extra mana regen from 39 spirit and ahhh dammit I just realized I did the crit calculations without considering that you are using the glyph of molten armor. So the crit rating you lose from the spirit loss in option 1, and amount of crit gained from +39 spirit in option 2, should be given a bit more emphasis in your head: 55% of spirit rather than 35%. It's late and I'm tired. YOU figure it out. I'm not good at etymology! (Or is it ichthyology? Which one is for counting things? Which one is where you learn to bury staplers in your backyard for religious reasons? Would those staplers be tax deductible?)

Sorry, back. Yeah so in option 2 you get 21.45 crit JUST from spirit, and then 64 crit rating. So damn, it's actually more crit than the Deathfrost Boots, despite how it would appear at first glance. So you see, burying staplers is useful.

And you gain 41 spellpower, and a bit of mana regen. But you still lose 56 haste. Which sucks, BUT, the nice thing about option 2 is that you get 2 yellow gems. So we can recoup 40 haste (2 Quick King's Amber) at the cost of the 46 spellpower you've currently got gemming your shoes.
So to redo a little bit of "napkin pharmacology", as it were:
You LOSE 5 spellpower, GAIN a ton of crit, gain a bit of mana regen, and only lose 16 haste.
Hmmph... at one point it seemed like it might end up being a good idea, but now we have you losing spellpower AND haste to get lots of crit. We're talking about damn near 2% of crit here, so it's clearly an upgrade, but again I'm scratching my head wondering why this would be worth 5 or 6 thousand gold.

Of course, you could use hybrid (Reckless) gems in those yellow sockets, in which case you would GAIN 19 spellpower but instead of losing 16 haste, you'd lose 36. 6 in one poop, half a dozen in the toilet. A Freudian Slip is when you say one thing but you really mean your mother.

So to give a short answer to your question about why you shouldn't upgrade the boots: the ones you have "suck" because they're only ilvl 226, but they're itemized almost perfectly. Both 264 boots are upgrades but you upgrade to shitty itemization.

Btw, you have a talent that increases spirit by 10% so adjust all numbers I've mentioned accordingly. Also, you have a talent that gives you spellpower equal to 15% or your intellect, so that's +5.2 spellpower for either of the 264 boots.

Coda:

I think you're now safely over the hit cap, enough to get spellpower on those gloves instead of the hit rating (if you DON'T have a Draenei in the party, you'll be 1 hit rating short, but that's like maybe missing 1 spell a week, and if you DO have a Draenei there you'll be 25 points over. Both of those assume that there's no shadow priest or druid putting the debuff on the boss (misery or Faerie Fire)).

So that's 28 spellpower right there. Also, not to be nitpicky or nothin, but your bracers aren't enchanted, so that's an extra 23 spellpower for free.

There ya go, 51 spellpower, (OOPS 30 sp on bracers, so 58 total) a better upgrade than either of those 264 crafted boots, and it didn't cost 5 primordial saronites.
Not to discourage you from getting them, if you have the money and just want to put your character into.
UPDATE: looks like I forgot to finish that sentence.

You know what else? I could have saved myself a lot of fucking time if I had STARTED by checking the fucking Ruby Sanctum loot table, rather than realizing that it might have something worth looking, sort of as an after thought, just before I post this.

http://db.mmo-champion.com/i/53119/boots-of-divided-being/

Better than either 264 crafted piece, at least for an arcane mage. Much better. (UPDATE: I'M RETARDED, THOSE ARE MAIL) And free, drops on 10m reg, and we'll be running it starting next week.

Goddammit.

This is my current ui, the pink number in the top left corner of each box is the timer on my rejuvenation on the target. The green number in the top right shows my timer on regrowth. In the pic below you can see tiny yellow numbers of Z's and my health bar, those numbers show me that we both have one wild growth on each of us and it has 2 seconds left on it. The larger number in green, on Peeve's bar near the bottom, is the timer on my lifebloom(it says 8-3 atm) and indicated that he has 8 seconds until it will bloom and 3 stacks on him.

This last pic is of my much older ui. It's common to start out with large bars taking up a lot of space. As you get used to healing you will want to minimize the fuss and free up screen space.