Sounds like you're new around here. I'll see if I can help you out.
Socket 1155 refers to the socket the CPU is made for. Intel has their line of CPUs, mainly the i-series. The first generation(all of this refers to Intel's I-series) has 1366 pins, and was therefore called LGA 1366. Intel's 2nd and 3rd generation of chips has a socket of 1155 pins, therefore being called LGA 1150. Intel's latest socket to-date, 1150, follows the same naming scheme. Intel's first generation of I-processors have a name of i#-###. Second generation had i#-2###. Third gen had i#-3###. Fourth generation has i#-4###. See the pattern?
Now, some suggestions on your build. You didn't state a budget, so I assumed the build you posted was your budget.
http://pcpartpicker.com/p/1YYmv
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor. You don't need an i7 for gaming. Most of the game will rely heavily on the graphics, the GPU. As you can see, the CPU I picked is a third-generation processor. However, the fourth generation series is out. Why would I pick an "older" processor? The fourth generation processors don't have much to offer the desktop world. They run hotter, and have better integrated graphics. The fourth generation processors just don't give you the performance increase as you'd probably think. I personally chose an Intel i5-3570K when Haswell(codename for Intel's fourth generation CPUs) was out, and I have absolutely no complaints.
Cooler: Cooler Master Hyper 212 Plus 76.8 CFM Sleeve Bearing CPU Cooler. You really don't need a cooler on your CPU, unless you do it for CPU longetivity(even though they last quite awhile, and will become outdated before they break, usually) or bling. The stock cooler will work fine, but if you still want a cooler that'll be a bit quieter and make your CPU run nice and cool, this would be a great option. The difference between the Plus and EVO is maybe 1-2c. Not worth the extra money.
Motherboard(MOBO): MSI Z77A-G45 Gaming ATX LGA1155 Motherboard. It contains the capability for SLI in the future. Unfortunately only the higher end chipsets support this feature.
RAM(Random Access Memory): G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory. If you're not using a dedicated graphics card, you only need speeds of around 1600mhz. The numbers after DDR3-#### indicate the clock speed of the memory. IN GENERAL, the higher, the faster. This ram is on sale right now at DDR3-1600 prices, so I picked it up. It also fit the color scheme. 8GB is about the minimum you should get for a gaming build. 4GB will often max out in games.
SSD: A-Data Premier Pro SP900 128GB 2.5" Solid State Disk. What's an SSD? A solid state drive. These are MUCH, MUCH faster than a typical mechanical hard drive. Install Windows 7 and your commonly used programs onto here, and your boot times and program launch times(for those installed on the SSD) will be seconds, if not instant.
HDD: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive. Typical 1 Terabyte hard drive. This is all you'll really need for a computer.
GPU: PNY GeForce GTX 780 3GB Video Card. I switched out your GTX 770s in SLI for a GTX 780. I believe that getting a stronger, single GPU is always better, as not all games support SLI(even though the GTX 770 is a beast). If you ever desire more performance than a GTX 780 can deliver(and they're pretty damn powerful), I also planned this build for future upgradeability.
Case: Corsair Carbide Series 300R Windowed ATX Mid Tower Case. I would have gone with the Fractal Design Define R4 as it's a stellar case that's quiet, but the windowed version is currently $120. If you can find it around 80-100, pick it up.
PSU(power supply unit): EVGA SuperNOVA 750W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply. This will be able to handle the GTX 780s in SLI, even if you decide to overclock them a little bit. It's gold certified, and will run relatively cool.
OD: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer. Typical optical drive. Nothing fancy.
OS: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit). It was in your build. Windows 7 FTW.
I hoped this helped you a little bit. If you need any more help, then please do ask questions!