A few things. Firstly, you'll want to get the 64-bit Windows 7 OEM to fully utilise the 8GB ram since 32-bit can only use 3-4 GB. If you wanna save money (around $15), just get 1333 Mhz RAM. Instead of i5 and the GTX 650, you could get an i3 with a 7850. It will perform better in games, but perhaps not video encoding and the like.
Getting a 60 GB SSD would help in boot times and general responsiveness but don't worry about it if you can't stretch your budget.
oh yeah, thanks for pointing that out. And what do you think about an i3 and a 650 Ti?