From my own experience when boxing 5x toons on i5 2500k, you have to lower the graphics all the way to low if you want everything to run smooth, cpu usage is right on the border, when you enter org, server is pretty heavy where I play. Its ok to stream, but it may spike/lag in some areas (in instances is smooth as butter) if you cut to 4x toons its perfect, I cant believe how much of a different is is from 4 to 5 box. So what I would do Get i7 2600k no matter what, I made huge mistake not going to i7 (I'm going to change my cpu soon) 8gb of ram is minimum, im running at 5gb atm with win7 64bit spikes to 6 when i hit org. So from what i can tell/see : i7 2600k with 12gb would be perfect.