$500 New Comp Build (for minior gaming)

Wussup guys,
I am build a computer for minior gaming and i just need the core parts.

APPROXIMATE PURCHASE DATE: End of this month BUDGET RANGE: (US$100-500)

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: (gaming, watching movies, surfing the internet. )

PARTS NOT REQUIRED: (keyboard, mouse, monitor, speakers, Rom drives, OS) **Re using a 450watt PSU**

PREFERRED WEBSITE(S) FOR PARTS: Any trusted sites

PARTS PREFERENCES: nope just want it to be reliable

OVERCLOCKING: Maybe in a few years SLI OR CROSSFIRE: No

MONITOR RESOLUTION: (1280x1024)

ADDITIONAL COMMENTS: I would like a quiet PC

Here is my list feel free to comment but plz stick within the price range for the items:

Intel Pentium E5200 Wolfdale 2.5GHz 2MB L2 Cache LGA 775 65W Dual-Core Processor - Retail
http://www.newegg.com/Product/Prod [...] 6819116072

G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Prod [...] 6820231166

SAPPHIRE 100245HDMI Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
http://www.newegg.com/Product/Prod [...] 6814102824 --Already bought for $90

GIGABYTE GA-EP45-UD3L Core 2 Quad/ P45/ DDR2-1366+/ A&GbE/ ATX/ DES Motherboard
http://www.ewiz.com/detail.php?name=MB-45-U3L

Western Digital WD3200AAKS 320GB SATA2 7200rpm 16MB Hard Drive
http://www.ewiz.com/detail.php?name=HD-W32AAKS

OR

Seagate ST3250410AS 250GB SATA2 7200rpm 16MB NCQ Hard Drive
http://www.ewiz.com/detail.php?name=HD-ST25S4

With the hard drives i just want one that will not DOA on me or die anytime soon want it to last for a good 5-10 years
I am still unsure about the mobo so i will take any reconmmendations
I would like a new case with a power supply but not willing to spend more than $50 on it


THANKS!!

It's fine build, but yes what PSU?

This is not really better... unless you think you might need to upgrade to 8GB in the future:

ASRock DDR3 P43 MB
http://www.newegg.com/Product/Prod [...] 6813157130
I never quite understand how these guys do this... P43 is not supposed to support DDR3. ASRock is always doing stuff like this and making it work.

G.Skill DDR3 1333 CAS 7
http://www.newegg.com/Product/Prod [...] 6820231200
It's the same performance as the RAM you chose, same price, only DDR3.

If you were doing some memory intensive task I would say go DDR3 now, but for a budget build it doesn't make much difference.