Motherboard:
2. ASUS P8Z77-V
I say get the Pro if you need more SATA and USB. Otherwise...not necessary.
GPU:
ASUS GTX 670 DirectCU II TOP
Model No: GTX670-DC2T-2GD5
Either GPU will do. The GTX 670 is an awesome card. Assuming you can find stock.
Processor:
2. Intel i5 3570k
RAM:
None of your memory choices. I'd get the Samsung 30nm 4GB sticks. They are available individually for $24 each. They're lower voltage at 1.35v, low profile so they fit under any CPU cooler you might get, and overclock well. Don't fall for the fancy naming schemes and huge heatspreaders with crazy colors. Just get two of these
http://www.newegg.com/Product/Produc...82E16820147094
These are rated at DDR3-1600 1.35v 11-11-11-28 and I can run them at 1.5v DDR3-2000 11-11-11-28 or DDR3-1800 1.5v 10-10-10-10-24. I could probably tweak timings a little bit more on my BIOS but I'm too lazy to bother. The difference between DDR3-1600 and DDR3-2000 is very small.
Power Supply:
3. Corsair CMPSU-750TXV2UK 750 Watts PSU
4. Seasonic 750W Power Supply (SS-750JS)
Either of these Power Supplies will do nicely. I have owned a Corsair TX-750 myself and can attest to the quality. Buy whichever is the better deal.
Cabinet:
1. Corsair 400R Mid Tower Cabinet
2. Cooler Master HAF 912 Advanced Mid Tower Cabinet
3. Cooler Master Enforcer Mid Tower Cabinet
4. Thermaltake Commander MS-III Mid Tower Cabinet
5. Thermaltake V4 Black Edition Mid Tower Cabinet
Case is highly based on preference. I could not tell you what to get. They're all good, buy what fits your size and expansion requirements.
Hard-Disk:
2. Western Digital Caviar 2TB (7200 RPM) SATA 6GB/s 64MB (WD2002FAEX)
Can't swing an SSD for startup drive? Crucial M4 128GB is $121 at amazon right now. I would personally avoid seagate HDDs if it were me. I have had many issues with them.
Monitor:
3. Asus 24 inch LED - ML248H
4. Viewsonic 23.6 inch LED - VX2453MH
I've seen both of these monitors and both are good.
Mouse:
3. Logitech Optical Gaming Mouse G400
Razer and steelseries mice are WAY overpriced and all the fancy memory and profile stuff is buggy as heck. I've had razer mice and the drivers always crashed and the mice froze a lot due to bad firmware. I have the G400 and I did compare it to the G500. I found the G400 to have a better feel and lighter weight which I preferred and I didn't have a chance to try out the weight customization thing on the G500. I couldn't imagine a heavier mouse being better I don't buy into the fact that laser is more accurate, i've heard it go both ways. Laser mice suffer from negative acceleration as well which hasn't been 100% totally fixed yet. Negative acceleration can be explained like this. Imagine there's a point A and a point B on your mousepad. If you move your mouse slowly from A to B, in the game you will turn 180 degrees. However, if you make the same movement from A to B, only faster, you will only turn 90 degrees in the game. Anyone who says you need 2000dpi for gaming is crazy lol. Many of the best players run lower sensitivity and DPI with a larger mouse pad because it's more accurate than twitch movements.
Overall buying a mouse is a lot of preference. Go to a local store and feel them if you can. See what you like in your hand. Not all mice are made for the same type of gamer. Some are better with a palm grip, some with a claw grip etc. So go put your hand on the mouse and move it around just as if you were at your desk. How does each feel to you? You'll probably like one more than the other and comfort is a big part of gaming. The proper mouse will keep your wrist relaxed and prevent cramping. Just like the right chair is good for your back.
Mouse Pad:
Razer mousepads are overpriced. I like Hybrid pads. They are a soft cloth pad with plastic impregnated into it so it has a smooth feel when you move the mouse. Best of both worlds Glide + Control. I use an Xtrac Hybrid. Measures 10" x 16" x 3/16". Only $30 too.
http://www.xtracpads.com/products.php?prod_id=27§ion=1
Keyboard:
After using mechanical keyboards I am not a fan of rubber membrane keyboards at all. I will not offer a recommendation for them because I feel the performance difference and lifespan difference between the two is too great. Mechanical keyboards are expensive but they will likely outlast any other component you purchase. You can also customize the feel by selecting the switch type you want. For pure gaming I'd get a Leopold linear force keyboard with cherry MX black switches. If you want a good all around keyboard the tactile touch keyboard with cherry MX brown switches is a good pick too. Elitekeyboards.com sells them but they are $90 to $110. Worth it IMO though.
Other than that, logitech has good support so if you are only willing to spend around $50 go logitech. I am not a razer fan.
Many of the peripherals are preference based. As I said, mice and keyboards. They can have different weights, feels, the keys of a keyboard can be heavier or lighter or have a tactile bump to let you know when you activated it. Cases are a lot of asthetics as well as your required expansion bays. Just remember, if you are going to overclock be sure to get a good cooling system to go with it all. The stock HSF won't do you much good if you push it.