Building PC, Need some opinons

You can get an overclocked 4850 for less.

ASUS EAH4850 TOP/HTDI/512M Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168... $154.99 - $30.00 MIR

Use some of the money saved and upgrade the PSU. Thermaltake PSU's are only so-so. You're safer sticking with Corsair, PC Power & Cooling, Antec, etc...

Corsair VX450W ATX12V & EPS12V Power Supply - CMPSU-450VX
http://www.buy.com/prod/corsair-450w-vx-series-12v-atx-... $69.99 - $10.00 MIR

That RAM needs high voltage and doesn't have great timings. I'd pick up one of these kits instead:

G.SKILL PI Black 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168... $49.99

mushkin 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168... $45.99

Do you need a micro-ATX board? You can get a full size ATX board for less. That way you'll have more expansion slots.

GIGABYTE GA-MA78G-DS3HP AM2+/AM2 AMD 780G HDMI ATX AMD Motherboard - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168... $85.99

Thanks for the reply,
I've never really built my own computer on my own so im not really sure what to get or go with.
But wouldn't i need a little more Wattage from the psu? or do you think 450 is more then enough? tell me what you think about http://www.buy.com/prod/corsair-tx-650w-atx12v-power-su.... just a little more money.
And the overclocked card, im not really sure what overclock is ill prolly look it up right after i post this but thats not gonna ruin anything right, ive heard stories and such about "overclocking fried such and such".
I dont think i need a mirco atx. My case is just as big as my old one and it didn't have a micro. My old motherboard was a asus a8n sli-deluxe.
I'm trying to make this for more gaming where i dont have much lag in such games as "Left for dead", "WoW", "Counterstrike" and so on.
Thanks.

The Corsair 450W PSU would power the system, but the 650W would leave more headroom for future upgrades. If the 650W PSU fits into the budget, it's a great upgrade.

The GPU is factory overclocked (faster). You don't have to worry about a factory overclock since it comes that way and is still covered under warranty.

Awesome thanks alot, you've been a big help. do you know of a better upgrade for the motherboard? i've been thinking twice about it. Would SLi be worth it?
How do you think this setup would run wow and left for dead?
So far its almost a 400$ setup and i have 200$ more.