You're going to have a hard time getting someone to recommend a pre-built for you on this forum. Most of us, including me, are going to comment on this thread until we can get you to just make one and save yourself money/get much better parts.
Now before you go all "I ca't build one because I don't know jack about computers" on me, take 40 minutes of time and become a pro at building them.
That's really hard to do, as they usually use ok components except for the power supply. Unless you pay them alot more, they stick a really lame power supply in there, which generally doesnt sit right with me. Power supplies cause alot of problems if they are not high quality.
Most of them are not balanced really either. In that for a gaming computer, they put an i7, where for gaming you really don't need more than a i5. The i7 doesnt offer any more performance.
That's why I prefer the building route. You get quality parts AND feel accomplished.
Most of the Cyberpower ones I am looking at are horribly unbalanced. I didn't find any that I liked. At that price, they are putting in Radeon HD6670's.
At $700, I can usually put in a 7850 into my computer.
Especially at the price of $700, there's nothing that can really shine in terms of gaming performance. They all have strong-ish processors, which is their main selling point.
But they also have very weak power supplies and GPU's.