Graphics card question

current specs:
Processor: Intel(R) Pentium(R) 4 CPU 2.40GHz
Memory: 1024MB RAM
Hard Drive: 119 GB
Video Card: NVIDIA GeForce4 MX 420

more detailed specs:
http://support.dell.com/support/edocs/systems/dim4550/techov9.jpg
http://support.dell.com/support/edocs/systems/dim4550/specs.htm

If I got a 450w Power Supply (I currently have a 250w), what [compatible] graphics card could I get that would give me a stable 50/60 fps, without having to buy a new PC? I currently get 15-60 in 5v5's; usually around 25-35, but it keeps fluctuating.

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