Computer tech is always moving, fast. So if you were to buy somthing it will be outdated quickly. To be simple, you're going need a better graphics card and more RAM if you want to get the best out of future games (and oblivion if thats what you want to do), a new CPU wont hurt either. There are lots of good offers about atm, http://www.gladiatorcomputers.com/ has some good deals. However if you realy want good advice we are going to need to know your budget if you were to upgrade/buy a whole new rig.