Upgrade stock HP a6614f?

[Get2DaChoppa]

I was wondering, if at all poss, what would be some good upgrades. ive been told that the geforce 6150se in it is crap. im sure the whole system is subpar, but was wondering what good graphics card would work. Have read that the nvidia 9800 GT 1gb is good. Any help?
Came with
PAsus M2N68-LA MOBO
AMD Phenom 9500 quadcore 2.2ghz
nvidia geforce 6150se
6gb ram
PSU 300W

 

[daisymtc]

What is your budget?

 

[Get2DaChoppa]

about 300 bucks.

I was looking at a geforce 560 gtx ti and a bfg 750w psu. but i am not sure what slot i need in the mobo. there is a pci express x16 slot, but not sure if that is good enough.