Gaming is the #1 factor, but I also use my computer for work and college, which aren't nearly as demanding. Lot's of multitasking for work and college, like both my monitors have about 3 pages each up with 1-2 programs running as well.
My budget is $700 - $1000 roughly, more if I can sell or even re use some parts from my current computer.
I was thinking if I bought just a case and put it together myself it would be cheaper, but what do you think? I am still learning all the hardware stuff.