I have a mobil 2600 on shuttle an35 ultra with i gig and a 9800 pro. I am thinking of upgrading the mb and cpu, but have not kept up with different chips and socket types. What's the biggest boost for the littlest amount of money could I get?
I think you have to give us an idea of how little you want to spend. Certainly, the cheapest system to buy would be a socket 754 based system, but for a modest additional amount you could get a socket 939 system. Also, tell us exactly what components you are looking to replace.
I doubt $200 would be enough to switch to 939, unless you went with the nf3 chipset and kept the AGP card.
My question to you is how long do you plan to upgrade again?? Month, year, two years?? If you plan to upgrade again after this around end of 06 early 07ish i would say go with 754 for now and save up for M2 when its released.