Upgrading Computer for Battlefield

[m00ch0]

I Currently am running

Intel Pentium 4 CPU 3 GHz socket 775
Ram 512mb
NVIDIA GeForce FX 5500
Motherboard: Abit AS8-V

I would like to keep my processor as I know this isn't the problem its more the ram and graphics card but in order for me to get a top class graphics card I need pci-express on the motherboard (i think)

so any help on picking some items out would be great

budget is about 300 - 400 maybe more

 

[m00ch0]

thanks for all the reply's I'm abit confused on if I should keep my CPU now I could just change the whole lot and sell my things i have now!

 

[m00ch0]

I think it would be a wize decision to go for furture games