WiiUMasterGman :
You won't need the sound card. You don't need sound cards anyways these days. Even my old Asus Sabertooth P67 has 7.1 audio.
Audio
• Realtek® ALC1150 Codec
- 7.1-Channel High Definition Audio
- Supports S/PDIF output
That is from the MSI website
Spoken like someone who's never used a dedicated sound card
Granted integrated audio on motherboards has vastly improved over the years and you now get some pretty competent sound out of them, but you're missing out on features like Dolby Digital Live, DTS, and EAX and yes, those definitely make a big difference especially when it comes to games.
As for a dedicated sound card, the Sound Blaster Z is $100 on Newegg and $92 on Amazon and I've seen it go on sale sometimes for $79.99. I wouldn't buy anything lower than that though as is won't be enough of an upgrade over your integrated to justify.