Take advantage of the Intel i7 CPU. With a nice motherboard and RAM you got the PC end pretty much covered.
Its the rest of the set up that you need to look into. You can start of with an M-Audio AUDIOPHILE 2496
.This will give you enough in/out options for your set up. Although when you want to start recording real instruments, mic's, etc, you'll want an interface with more in/out options and maybe, M-Audio ProFire 2626
Get the computer and software, with your audio interface, then go from there. Theres tons of software our there too.