Post by StrangerWifCandy
Don't mean to necro a thread, but yes, PI and IV stack (along with Scale of Fates, mmm 1.1 second frostbolts)
However, I have more important news. I'm toying around with my character profiler, and I found if I replace the relent hood with T9, it gives me enough hit and haste to replace all of my yellow hit gems with sp+haste instead, and my trinket with the WG spellpower one instead.
Now, we're talking 23k health unbuffed, 16% haste, 14% crit, nearly 2900 (you're not seeing things) spellpower, and 843 resilience.
You can go a little higher with more pve gear, but you need access to a guild that regularly runs heroic ToC25 to see upgrades over the relentless gear (which I unfortunately do not have, so I settled with the iLvl245 T9 helm).
Here's a link to the profile. http://www.wowhead.com/?profile=14117233
Oh yeah, I replaced the staff with MH+OH, for more spellpower. Staff will give you a bit more haste, stam, and resil, for about 40 less SP. Mages don't get focused too often, so I think the trade-off is fine, and you end up saving 400 or so arena points.
I get excited thinking about how hard my shatter combos are going to hit a couple weeks from now when I can purchase all of my pieces. 2400 here I come!