I like it, other than the RAM issue mentioned already. It's a shame you can't stretch to 16gb RAM, or more importantly, move up to the 770 card from the 760 series, as the performance jump is significant. Also, how soon do you need to build this? nVidia is announcing it's new 9xx line of video cars in just over a week now, another 8 days I think, and the 7 series may likely drop in price a bit. Certain 780ti cards are already having huge price drops all over the net, some 100 to nearly 200$ drops on newegg and ncix and the like. So, waiting just a tad may, MAY, save you some $, and let you move up a tad in performance.
Also, regarding the Samsung SSD, I'm using Samsung 840 EVOs as well, and had the 128 830 EVO as my boot drive for a couple of years with no trouble, even running AH on it when I hadn't known it was recommended not to as due to small read/writes it's hard on them. No trouble. That said, the model you've picked will work just fine, Samsung has a pretty big rep for SSDs in the PC/gaming world, but that doesn't mean that other stuff isn't good either. One other thing regarding HD, is that SSD the only drive you're going to use? You realize I'm sure that after format, and then instal of Win7 or 8 that 256 gb SSD will be well under 200, and that they don't always run happy when squished right full. That isn't much room at all, not nowadays. Heck, my Steam folder alone is way, way over that, and it's not all that many games really. I would say of all the things that could be addressed or changed, this is probably the most critical, other than making sure you get the proper RAM, (8 gigs WILL suffice IMO, just 16 would be a primary upjump should you be able to stretch or change anything budget wise). I just think that unless you only are using this for very limited stuff, ie say just AH and maybe a few other games here and there, that you'll soon run out of space. Many guys add a spinner 7200 rpm drive to similar builds, you can get a 1tb drive for 50 or 60 bucks if you look around, and you'll be glad you added it IMO.
Your case - Bravo to you. I bought a C70 Black the first day they came out. I'm a huge Corsair fan boy, and have supported their stuff forever. You'll love that case, it's tough, solid, and has nice rubber spring loaded handles on the top, which makes moving it around a snap, where as nearly every other case has no handles and needs to be picked up from the bottom, a pita a lot of the time IMO. If you can swing another 20$ or so pick up another 2 case fans, there is ample room for them and it'll help your temps a great deal if you're going to o/c either your CPU or your GPU. Corsair PSU's are great as well, similar to Samsung and the SSD's, SeaSonic has "the" rep for PSU's, but Corsair PSU's that aren't already mostly manufactured by Seasonic are equally well made and reliable IMO. I'm using an 850 modular and a 1050 as well from Corsair, and I've had excellent luck with both for a couple years now.
Overall, very solid build, with some different/better RAM. Win 7 or 8 is personal pref IMO, I would pick 7 myself, but 8.1 will work just fine as well, it's just different is all, and mainly networky types are the ones who dislike it greatly. Again, I would try and wait just a week or two and see what nVidia's new stuff brings in terms of price reductions, as by October it's likely the 9xx cards will be selling instead of the 7xx as the frontrunners, so a good 770 card will quite possibly be in your sights, and one of those o/c a bit with that CPU o/c'd will work well with virtually any game you throw at it right now.
