I don't have the best set-up for this day and age, so I'm looking for some fun games that can be played on my PC. It's running at about 2.3 GHz, 512 MB RAM.. Graphics card is a Nvidia Geforce FX 5200 128MB. I will play most kinds of games, I prefer First person shooters less than others, however. But any good suggestions at all will be appreciated. I just want games that will run well on my PC and play well at the same time. Any help is greatly appreciated.

Got a pretty outdated setup, at least by the standards of newer games coming out. Below are my current computer specs, and I'm looking to either upgrade or buy a new computer, whichever is cheaper. I'm currently looking for a system that will run Oblivion at the higher settings without a hitch, I'm using that as a base for the system I'm looking for.

 Operating System:

 AMD Sempron 2300+, 1.58GHz

75GB Harddrive 

512MB RAM

Graphics Card: GeForce FX 5200, 128MB RAM

 What should I look into getting so I can run the latest, next-gen games? Or, what could I do with my current setup to make some newer games run a little better? Any help is appreciated.