I am interested in upgrading my dell 4600 to a core 2 duo processor and motherboard. I want to keep my case if possible, as I have modded it and like it like it is. I also want to keep my agp slot and stay with ddr1 dual channel. Does anyone have any suggestions on a processor/motherboard combo that will work for me? If I have to change power supplies that is ok. It probably needs upgraded anyway.