I know a good dozen that have reached the 1900Mhz to 2050Mhz range with XP1600s that were AGOIA 0204 or newer cores. Heck, Chainbolt reached 1921Mhz with an AGOIA 0206 XP1600
on air cooling with an
unlocked chip. The lowest I've seen good OCers get any of the AGOIA cores is upper 1800s. You need a board that you can get in the 2V to 2.2V Vcore range with though
FYI - did you try cleaning off your current processor to see if she was
really dead??