~$400 budget build

My recent GASing (guitar acquisition syndrome) has put me out of the hardware loop and crushed my savings. So I need help with this build.

APPROXIMATE PURCHASE DATE: Soon, next week maybe

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, Music, Photo editing (minor), General office crap.

PARTS NOT REQUIRED: Monitor, speakers, keyboard/mouse, DVD drive, GPU

PREFERRED WEBSITE(S) FOR PARTS: I like newegg but I'm fine ordering from somewhere else

PARTS PREFERENCES: AMD (just 'cause 775 is screwed and i7 is WAY too expensive) otherwise I don't care.

OVERCLOCKING: Not now but possibly in the future but even then it would be nothing major.

SLI OR CROSSFIRE: No

MONITOR RESOLUTION: 1280x1024, possibly 1680x1050 down the road.

ADDITIONAL COMMENTS: This is a build for my mum/brother, the computer we have now has a Pentium 4 . The build I was going to do last year before my mom backed out had a 64 X2 7750 and a Gigabyte GA-MA78GM-US2H mobo, but they are no longer around.

I'm assuming AM3 is backwards compatible like AM2 was and that will leave some room for later upgrades. So basically the only requirements are that it have some kind of AMD processor with a decent AM3 mobo, and at least a 250gb HD, preferably larger.

Normally I'd do some research and pick parts myself but I'm back in school now so my time is cut and I want to do it quickly so my mom doesn't change her mind (she doesn't understand how obsolete the current machine is, actually its impressive how long its lasted ).

Your budget is a little two low for a decent gaming rig, if you can spend more check this out for about $550:

AMD Phenom II X2 545 Callisto 3.0GHz 2 x 512KB L2 Cache 6MB L3 Cache Socket AM3 80W Dual-Core
http://www.newegg.com/Product/Prod [...] 6819103694

GIGABYTE GA-MA770T-UD3P AM3 AMD 770 ATX AMD
http://www.newegg.com/Product/Prod [...] 6813128392

Patriot Viper 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop
http://www.newegg.com/Product/Prod [...] 6820220285

XFX HD-485X-YDFC Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported
http://www.newegg.com/Product/Prod [...] 6814150337

OCZ ModXStream Pro OCZ500MXSP 500W ATX12V V2.2 / EPS12V SLI Certified CrossFire Ready 80 PLUS Certified Modular Active PFC
http://www.newegg.com/Product/Prod [...] 6817341016

SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD-ROM 48X CD-ROM 2MB Cache SATA
http://www.newegg.com/Product/Prod [...] 6827151187

There are places you could cut back, however in my opinion they would render the computer inadequate for gaming...

Well if reusing GPU/ODD :

The GPU is a HD 3850 512mb. I ran Fallout 3 on high setting and Crysis on medium at 1680x1050 and got decent FPS so I think it will work, at least temporarily.

Here's the list so far:
CPU: AMD Phenom II X3 720 2.8GHz $120
Mobo: MSI 770-C45 $130
RAM: Patriot Viper 2gb (2x1gb) $54
PSU: OCZ ModXStream Pro OCZMXSP $0 (mobo combo)
Case: COOLER MASTER ELITE 335 RC-335-KKN1-GP $40
HDD: SAMSUNG Spinpoint F3 HD502HJ 500gb $50
GPU: HD 3850 $0
OS: Windows Vista $0
------------------------------------------------------------------------------------------------
Total: $394
I'd post links but my internet connection is painfully slow.

It fits perfectly in the budget. Extra RAM is easy to pop in and a the GPU would also be easy to swap out. Case ships free which is a plus.

My only question is about RAM voltages. That RAM is 1.7volts, do I need to set them in the bios or is fine to just stick 'em in?

Ok, thanks for all the help.