Building computer for Bday help please !!!

My birthday is coming up and I am looking to basically build a whole new computer with a few parts from my old computer thrown in. I am gonna get a new processor/ PSU/ graphics card/ motherboard/case. I did a little shopping around on newegg.com and this is what I came up with. Now just so you know, I am not the most tech savvy person out there, so any advice would be great. Now I might be able to stretch my budget a little if need be. I keep hearing comparisons on different brand names and different versions of a product (example 640mb gts vs 320mb gts, 650i mobo vs 680i), if there is a version that is superior to the one below please let me know.

Also I will be looking into overclocking some components.....when I know exactly what to do that is. I am a gamer at heart so I will be playing the latest and greatest games on this computer.

Last but not least. I tried to build  a computer last year and it didnt turn out so good due to my lack of research. So this time around I would like to get it right. Do any of you tech experts see anything that would cause compatibility issues or anything that would be  a problem?

Processor: Intel Core 2 Duo E6400

http://www.newegg.com/product/product.asp?item=N82E16819115004

Power Supply: OCZ GameXStream OCZ700GXSSLI ATX12V 700W Power Supply

http://www.newegg.com/product/product.asp?item=N82E16817341002

Graphics Card: EVGA 640-P2-N821-AR GeForce 8800GTS 640MB

http://www.newegg.com/product/product.asp?item=N82E16814130071

Motherboard: ASUS P5N32-E SLI Plus LGA 775 NVIDIA nForce 650i SLI ATX Intel Motherboard

http://www.newegg.com/product/product.asp?item=N82E16813131153

Case: Black/ Silver Aluminum Construction Plastic Front Panel ATX Mid Tower Computer Case

http://www.newegg.com/product/product.asp?item=N82E16811146018

Thanks in advance.

Kick the processor up to an E6600, change the power supply to the Corsair HX620w, get the 320MB 8800GTS if your monitor is smaller than 24", get the ASUS P5N-E instead of the P5N32-E SLI, and I'd also recommend picking up some RAM so your system actually works - 2x1GB of G.Skill DDR2 800 should do it very nicely, and won't break the bank.RayvinAzn