Motherboard Sound -Please help

Hi, so I've decided to go with the 780i series of mobos for my triple SLI gtx http://en.wikipedia.org/wiki/GeForce_9_Series 280s. I found out that the only mobo with enough space for 3 of those GPUs And a sound card is the 790i, as the 780i apparently has 6 slots, and the gtx 280s each cover 2.

So, I was wondering what is a good motherboard http://en.wikipedia.org/wiki/Motherboard in the 780i (or any mobo that supports triple gtx 280s and ddr2 http://en.wikipedia.org/wiki/DDR2_SDRAM , if more exist) series? What am I looking for is one that fits 3 GTX 280s and comes with an integrated sound card

Thanks.

Edit: I'm also wondering, does the onboard sound card still take up a slot like an individual one would? In other words, would I still not be able to fit 3 GTX 280s with a mobo that has integrated sound?