Welcome to the forums.
You came to a place that can help.
I was going to buy prebuilt around 6 months ago....the people on here talked me into building, and it is the best thing I have ever done. I love my pc.
Any way I can recommend my mobo, however it is pricy.
Asus P5N32-E SLI
It is definitley a gamers board, so if thats not what you want your pc to mainly do,then I would not purchase it.
You will get alot of help and suggestions here, then you can make your choices. Enjoy your stay and have fun building.
Cooler Master CM Stacker Case
Asus P8Z68 V Pro/Gen 3
Cooler Master V6 GT Heat Sink
8 GB G-Skill DDR 3 1600
GTX 570 SLI
Asus Xonar Essence STX Sound Card
Grado RS1i & AKG Q701 Headphones
MAD EAR + HD Headphone Amp
Corsair CMPSU 850 Watt
Western Digital Black 500 GB
Crucial M4 64 GB SSD For Windows 7 64 Bit
Samsung 2494SW 24" LCD
Logitech G5 Mouse
Logitech G110 Keyboard