I'm buying parts from ebuyer.com today, for my new gaming rig. I need some help with it, and I'd prefer to buy all the parts from ebuyer.com however if there is a huge difference in price or a very good component is out of stock I could buy it from a different site, but I'd like to keep everything above 100 in ebuyer.
Intel Core i5 3570K 3.4GHz Socket 1155 6MB Cache Retail Boxed Processor
Asus P8Z77-V LX Socket 1155 VGA DVI HDMI 8 Channel Audio ATX Motherboard
EVGA GTX 670 FTW 2048MB GDDR5 Dual DVI HDMI DisplayPort PCI-E Graphics Card
Corsair 8GB (2x4GB) DDR3 1600MHz Vengeance Memory Kit CL9 1.5V
Fractal Design Define R4 Black Pearl Case
Coolermaster GX 550W PSU (It's 80 plus certified)
Liteon Ihas120 20x Dvd±rw (dual ±r)/ram Sata Drive
Microsoft Windows 7 Home Premium w/SP1
Western Digital 1TB Scorpio Blue Hard Drive - 2.5" SATA-II 9.5MM - 5400RPM 8MB Cache
The only things I'd change are the PSU and the hard drive. Ditch the Coolermaster PSU as its label will be a lie and/or the quality of its outputs will be sub-standard. Something built by Seasonic, FSP, Delta, or Enermax/LEPA would be better and safer choices.
Also, as lchrisk pointed out, you have selected a slow laptop drive. You want a 7200RPM 3.5" drive. I use and recommend WD Black drives because they are fast and have a five year warranty; some other drives have cut their warranties way back, which tells me they've changed their materials and/or methods in a manner that does not inspire confidence.
If you want to add an aftermarket cooler, for overclocking or reduced noise, the Xigmatek Gaia is cheaper and quieter than a Coolermaster Hyper EVO, and cools within 1C per Frostytech reviews. It uses silicon pegs (and includes an extra set for push-pull) instead of the hard frame that CM uses (which can also rattle).
Edit: It looks like you have a lot of duplicate entries.
Better in some ways, maybe not in others. The WD Blue drives are pretty decent; I've used them too (although not lately). The PSU is definitely a better choice.
Keep the original motherboard you chose though. The Z77 supports PCIe 3.0. Also, the Z68 may require a BIOS update to support an Ivy Bridge CPU; the Z77 will support it out of the box.