I just got an Asus Essentio Model: CG5270-BP004 and I'm very happy with it! It runs my Sims 3 WA super smoothly and other graphic-heavy games I play. The most important thing I wanted on my new computer was for it to be upgradable in the future and this one definitely is. I'm planning on upgrading the power supply to get a better graphics card, but the one it came with has been working really well so far, so I don't think it'll need an upgrade for the next 2 years or so. For $649.99 I think it's a great deal!

Check out the review here: http://reviews.cnet.com/desktops/asus-essentio-cg5270-bp004/4505-3118_7-33777273.html