I think we should let the OP decide here.
He can either have a sound card and a 7870 or 660.
Or he can have no sound card but a 7950 or 670 - or get better cooling.
Going to leave it up to him. It's his system at the end of the day. Whichever he chooses he's going to get a well-performing rig which will game very nicely indeed.
7970 to be exact.