AMD Athlon II x4 630 (2.8ghz)
nvidia 8800GTX
4gb DDR3
1TB HD

I'm considering upgrading my PC and wondering if anyone has any suggestions? I had a quick browse through the forum to see if there was any recent, similar threads but I couldn't quite find what I wanted. Any help appreciated!

I never keep up to date with the latest developments so it's quite daunting trying to find out what all the best buys are. I seem to remember reading about the i5 being the best CPU to go for because of overclocking capabilities?

Another question I guess would be, is it actually worth upgrading what I have?

Thanks in advance! :)