Planning to build a comp for the first time (critique my build please)

[KPark]

All right so I'm planning to build a computer for the first time and after some research this is what I came up with:


Case: $139.99 + $18.99 Antec P180 http://www.newegg.com/Product/Product.aspx?Item=N82E16811129154
PSU: $144.90 - $20 Corsair 620W http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=373110
MOBO: $214.99 + $6.14 - $15 Evga Nvidia nForce 680i http://www.newegg.com/Product/Product.asp?Item=N82E16813188010
CPU: $219 Intel Core 2 Duo E8400 Wolfdale 3.0GHz http://www.newegg.com/Product/Product.aspx?Item=N82E16819115037&Tpk=E8400
CPU Fan: $59.99 + $6.13 Zalman CNPS 9700 NT http://www.newegg.com/product/product.asp?item=N82E16835118019

or

$35.95 + $7.40 Scythe NINJA PLUS Rev.B http://www.jab-tech.com/product.php?productid=3538


Ram: $69.99 + $4.99 G.Skill 2x 1GB http://www.newegg.com/Product/Product.asp?Item=N82E16820231114

or 129.99 mushkin extreme performance 2x 1GB http://www.newegg.com/Product/Product.aspx?Item=N82E16820146677

GFX: $259.99 EVGA GeForce 8800GT Superclocked 512 MB http://www.newegg.com/Product/Product.aspx?Item=N82E16814130319
HDD: $119.99 Segate Barracuda 7200.11 (PR) 500 GB 32 MB SATA 3.0Gb/s http://www.newegg.com/Product/Product.aspx?Item=N82E16822148288
$179.99 Western Digital Raptor 150GB http://www.newegg.com/Product/Product.asp?Item=N82E16822136012
DVD Drive: $31.99 + $5.64 Asus 20x http://www.newegg.com/Product/Product.aspx?Item=N82E16827135157


I'm not 100% sure about the mobo, ram, or CPU fan decisions yet.
For the mobo I'm not sure if I need something that good and maybe I should get something cheaper.
Not sure if I made the right choice for the ram. I don't know too much about ram but I keep hearing those G skills being recommended
Should I even buy a separate CPU fan or should I just use the stock fan?

My range is around $1600
Any feedback on any part of my build is greatly appreciated

thanks a bunch