Suggest an upgrade please!

[khanis]

Current system specs:
X2 5000+ B.E @ 3.0ghz
790X-UD4P (AM2+ mobo)
8800GTS 320mb (620/14xx/920mhz)
6GB of DDR2 RAM
250GB HDD (Getting an extra HDD soon)
Stock AMD aluminum cooler (Terrible lol)
500w Earthwatts PSU
What upgrade do you suggest for around 300 USD?
I was thinking:
X3 720- 120USD
4890 or 5770 (160-180USD)

I mainly want to see an increase in gaming performance at 1680x1050 and higher.
Thanks in advance.

 

[HardwareGuru]

What would be your max budget on this build?

 

[HardwareGuru]

Nevermind, I did not read carefully. LoL

 

[SoAndSo]

gpu. go to a 4890

 

[HardwareGuru]

Here's your answer

 

[PolygonGTC]

Yeah, GPU is the obvious answer.

 

[khanis]

Here's your answer

Oh snap, that's pretty good. I'll consider it.
Thanks.