Need some help. :)

I'm in the market for a new graphics card and PSU. My goals are to be able to play most newer games at high-ish settings at 1440x900 res. The rest of my computer is pretty decent. Specs:

AMD Athlon 64 X2 5000+ 2.60 GHz

2GB of RAM

Vista Home Premium

Integrated GeForce 6150SE nForce 430

This is a prebuilt Dell, which is why I'll be upgrading the PSU as well. MY budget is around $150 for everything. Willing to go slightly higher, but not too much. Thanks for any help you have to offer. :)

Well, Heres GPU,psu,and 2gb of extra ram

http://www.newegg.com/Product/Product.aspx?Item=N82E16814500111&cm_re=9600gt-_-14-500-111-_-Producthttp://www.newegg.com/Product/Product.aspx?Item=N82E16817182031&cm_re=550w-_-17-182-031-_-Product

http://www.newegg.com/Product/Product.aspx?Item=N82E16820148342&cm_re=2gb_ddr2-_-20-148-342-_-Product

Thanks :) This sounds like a good idea. How do you think it will all hold up with games?

thanks for the help. I appreciate it. :)