help me build a gaming computer

[muffingirl]

hi, the computer i have right now is absoulutly awful, with only 160gb of memory 512 mb of ram and a proccessor that has 2.2ghz you cant do much with so what i need to do is buy a new computer, i want it to be atleast 2gb of ram and it needs to have a hard drive over 200gb and the ghz for me should be like 2.3ghz or better it doesnt really matter, i want a pc, and i want it to be good enough to play world of warcraft, and i dont want to build it myself if you can find one that had like a website where i can customize a good gaming computer for under 750$$$ at the most, if you know a good website i can get a reliable one for cheap let me know or even if there is a pre-built one, and i dont need a monitor but if you have any suggestions let me know$$$ and im not good with this stuff so you will need to explain most stuff in detail THANK YOU VERY MUCH