OK, I'll toss one out, this is actually a build I am running, but mine has a higher end video card for gaming, and no raid, because it's just a gaming rig, and backups to my local nas are good enough for it.
15-3350p New I5 no integrated graphics, not needed with an video card. 189.99
Antec 300 illusion Nice case, great heat dissipation. 69.99
DVD-RW DVD-rw 16.99
SSD Crucial M4 256gb 199.99 I love this drive, and it screams.
WD red 1 TB western digital red drives, new drives better for raid. 99.99 x 2
8 GB memory kit Corsair vengeance 1600 8 GB for 39.99
Motherboard MSI military grade z77a-g45 129.99
Power supply Corsair 600w builder series 69.99
MSI 55ti Nice video card for the money 139.99
Win 7 pro x64 139.99
Total 1196.89 Not including rebates,shipping,or coded sales. This is overkill for what you need now, but who knows in 3-5 years, and this system should still be fast enough to keep up with the newer stuff you would put on it. But as Goom says, this purely subjective, and really, any top tier system board that supports the newer I5 should be good, as well as Hard drives, but man, is it nice to be able to boot a system, and be on the internet in less than 30 seconds.