Oh hai friend.
Well, how much RAM do you have? If you have 2 gigs DDR2, you should be perfectly fine.
About your Gfx card, I use an EVGA nVidia 8800GT, and I can run Crysis on Very High (Overclocked though) with about 30FPS.
My specs:
EVGA nVidia 8800GT
AMD 6400+ dual Core 3.2Ghz
2 Gigs DDR2 Corsair
Anyways, your CPU is fine, its close to mine, and runs smooth & fast.
on
www.newegg.com the 8800GT is $169.00 = 86.6844 Great British Pound (not sure if its the right name)
For RAM, if you don't have 2 gigs (if you're using 32-bit)
Kingston HyperX NVIDIA SLI-Ready 2GB (2 x 1GB) DDR2 1066 (PC2 8500)Dual Channel Kit Desktop Memory That is about 32.8272 Greap British Pound.
Also, what is your motherboard? Like, what kind?
Flight Simulator X - Will run, though I Could Not run it at MAX MAX settings with my system, it pissed me off (the game itself) do I didnt have much time to test. Though the game ran good.
GTA San Andreas - ( No Lag At all ) - Easily @ Maxed settings
Call of duty 2-4 - Easily @ Maxed settings
Crysis ( If possible ) - You will have some trouble at maxed settings.
With Crysis, I have my GPU Overclocked, my CPU also, though its only a Super tiny bit over 3.2Ghz.
I run it with EVERYTHING at Very High except Shader Detail, that is at High.
Note: If you are using XP, you can only run the game on 'High' settings, as 'Very High' is DX10.
Only Vista supports DX10.
Battlefield 2 - 2142 Easily @ maxed settings