Can anyone pick out parts for a new computer?


I don't know that much about computers, but I have around $600-$700 after taxes to spend on building a new one.
Preferably parts from memory express so I can use their price match thing on every part

Would prefer one with a decent/above average sound card
Mainly for gaming, music, browsing in that order.
I already have a monitor, a mouse, speakers, and a keyboard.
Thanks