Which is more important to upgrade
 

Right now I am looking to upgrade my graphics card and my processor. I have a GeForce 4200 128mb and a P4 1.6Ghz. I will be upgrading to a Radeon x800 Pro and a p4 3.0ghz, 512 cache. For gaming in general, which do you think is more important that I upgrade first?

Processor. Your graphics card is still quite good in terms of graphical capabilities and if you have a faster processor, it will run more smoothly. Get the processor first.

Also, if you're looking to be gaming a lot, some more memory won't hurt. :)

I have a gig of DDR Ram, I'm alright for now

Out of those 2, processor