Do I need to get another sound card for this motherboard?

I'm "building" a comp on ibuypower.com and the motherboard I've chosen is a Asus P5N32-E SLI nForce� 680i SLI Chipset w/7.1 Sound. Is the onboard sound card any good? If not, I was thinking of upgrading to the Creative Lab Sound Blaster Audigy SE (which is also 7.1). What's your opinion? Most people don't like onboard cards but this one doesn't seem so bad since I'm not even getting speakers that are 7.1 (the ones I am getting are Creative Labs SBS-580 5.1 Surround Sound + Subwoofer). So should I switch or not?