I built my first desktop two weeks ago, I used that same Antec case, really nice, looks good, lots of space, and ventilates really nicely. I got it and a AMD 3.4 ghz Phenom II
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727 for like $210 it was a combo deal so it was $40 off. If you can find somthing you specifically want on new egg, look for combo deals to go with it, you'll get big savings that way, mixing your must haves and getting stuff your not as specific about in a combo deal.
AMD is the cheapest route to go, and from what I can tell for my use, just net surfing watching videos and gaming, its just a set behind the intel i5 for abouyt $150 less when you factor in the processor and MB. But I'm pretty computer dumb thats what I found in my research.
The had a deal on GTX460 MSI HAWK cards so i bought one, factory overclocked and one of the best in the 460 class I guess, I dont know, keeps up for me I just play CIV 5.
I have a 768 mb GTX 460 that I orderd as well, before I found the MSI deal, that I still need to send back. If it'll work for what you have in mind I'd let it go for a deal, to avoid the hassle of sending it back to newegg and dealing with a 15% restocking fee.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814500173