The board I posted is the full ATX version, there is a matx version also. The question if reliability is iffy. It's a less expensive board, but asrock tends to be pretty solid at reliability. The anniversary boards are extremely popular with the crowd buying the unlocked pentium, so thats a bonus. But it is cheap, so it doesn't have as many frills as the more expensive boards so you couldn't compare it's 'ruggedness' with an ROG or asrock extreme 6 for instance. But with a locked cpu, its not like you'll push many boundaries in power either.
If you were going to upgrade to sli, you'd need a good, more expensive z board for sure. Most of the cheaper boards will run x16/x4 pcie. For a budget card, that's fine to sli, most won't fill up the bandwidth of x4 pcie, but the 980 is a beast of a card, and x4 will kill performance. You really need x8/x8 at a minimum for a 980.
Best bet is spend the extra $ now on a really good mobo, so if and when you do decide to get sli, you are not wasting $.
I'd also look into a i5-4690k for sli as well. They run @$40 more than the cpu you chose, but there is a difference in power and ability between the 4460 and the 4690k and running SLI 980s is no joke on a cpu, you'll want a cpu that'll keep up with them.
You'll spend an extra $100 now, or spend $350 later and hope to sell what you had. If you opt for sli in the future.