What parts can I purchase to do what I want with this computer?

I use my PC for higher end gaming, however I want to upgrade a few things in it to make it better.

Specs:

2.4Ghz AMD 64 3800+ processor

Nvidia Geforce 9400GT graphics card

3G RAM

150G Hard Drive

Im wanting to play games Like Fallout3 and Dragon Age, and upcoming games like Starcraft2 and Diablo3 and have pretty nice graphics and relatively smooth gameplay. Can anyone tell me what I would need to upgrade to do that? (I looked up fallout3 on the "Can You Run It" website and the only thing Im short on is my processor and the game still kinda looks crappy, and Im not all to sure why.) Anyhow, If anyone could post links that would be great, Id like the best video card I can get for around $200 or so. Thanks!What parts can I purchase to do what I want with this computer?
an ATI 5770 is perfect. try this site out:

http://www.hwcompare.com/graphics/

this will; compare all your graphics cards.



Also try switching to an intel system or if price is an issue, an AMD AM3 socket so you can switch to hex core, dual or quad core whenever you want.What parts can I purchase to do what I want with this computer?
You need a new processor, you need at least 4 gigs of ram, you need a much larger hard drive, and then you'll be good. A good card around $200 would be a ATI 5770.What parts can I purchase to do what I want with this computer?
Any good graphics card will be help back by the processor.
I would have to say that's an older AM2...the 3800+ was a sempron 2.2GHz and your machine has probably a 250-300W PSU. To go up to a better video card...which you would have to do..you would need more power. with just 3GB of ram I suppose your running XP 32bit I would start look at windows 7 64bit to use more RAM. a 150 GB hard drive is a bit low and its probably IDE not SATA that too will slow you up. I would say you need a new PSU, better video card, more RAM, bigger hard drive, possibly a better CPU....If you "upgrade" all those parts you would still have an older machine with newer equipment! It may be more cost effective just getting or building a new machine! At least that way EVERYTHING will be new and up to date..more "future prof"!