I have been having some problems with my old Pentium 4 processor and i am thinking of upgrading. I play a lot of games like Age of Empires 3 and i need to know what would be the best processor for those types of games that isn't too expensive.
To the OP, what problems are you having exactly? If just a slow system, you may be able to run some diagnostic tools or do a fresh OS install to regain all the lost speed. If you just want a faster CPU, what is the P4 model number you have now? Their clock speeds ranged across +/-2.6 Ghz from low-end to high.
Honestly, and this is solely my personal preference, I would not use a dual-core with that Board, instead sticking with a faster P4 or a P4 w/ HT. Looking at the specs of the Board, if you want a dual-core CPU, you'd see a much better bang for the buck (not to mention upgradability) with a newer Board.