agree with AMD as well. Just don't buy the 3 core that everyone and their grandma recommends just because its $20 cheaper than x4.
I thought the antec 902 was a pretty ugly case, but it does have good cooling. Check out the coolermaster sniper case if you want to spend a bit of cheese on a good case. I spent $100 on a nice modular corsair power supply and it was totally worth it. Though the wattage calculator may say 450watts is ok, you might still consider a 550-650 watt supply.
Let us know if you need us to list specific parts for recommendation, but know that their is a thread all about that topic on the main systems forum page.
has a fun.