Hi, I think for purely gaming, you should get a stronger video card than a 550 TI, if necessary go cheaper on the CPU to fit your budget and consider a video card such as these:
Most quad core CPUs in 2012 will get the job done for you on the CPU side of things. Since you're considering 2x 550 TIs, I would advise you generally a single better video card is going to be more effective than 2 cheaper cards in SLi/Crossfire. Aside from the performance issues, the power consumption is dramatically higher when running 2 cheaper cards vs 1 single better one:
Cheaper CPU (In my opinion for gamers, theres no reason to buy the new Ivy Bridge over the prior Sandy Bridge, Ivy Bridges are known to get substantially hotter than Sandys under overclocking conditions and at best, stock to stock they're only 6% better: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Been building for years, and just got done with a new high end gaming ivy bridge setup. Here's some advice. Go with a Z77 Asrock motherboard. The boot up times are around 15 seconds with those. You won't be needing that CPU cooler though unless you intend to overclock. Also, I would recommend a RAIDMAX psu cuz they are cheap and quality. Been buying them for years, and never had any problems with them. Your GPU could be better, but if you're on a budget, I understand. Everything else looks great. Good luck.
That would work out pretty well yes. If you're still insistent on the Ivy Bridge however, you may as well go ahead and get a Z77 board as other suggested (there really isn't a difference in terms of real time but its one of those "What the hell?" things)