I do understand the problem here, I am just relaying what I know and whta I have been told by people who know far more than I do on this and when I mentioned to them I wanted to get the X2 4200 they simply pointed me straight in the direction of a DS3 motherboard and a Core 2 Duo cpu.
At the end of the day it isn't my money or my opinion that is the best but I am only relaying what I have been told