Making My Own Computer

[NoodleKnight]

Instead of only considering on what you want the computer to do, you should also design your computer around your budget limit.
And, from my experiences, Dual-Channel DDR does make a difference, but not that much, best save your money for something else. I've always stuck to intel processors since they generally are a bit more reliable, and run less hot, than AMD's. AMD's are much faster and cheaper, though.