<< I heard that all 1.2ghz+ chips are unlocked? Is this true even for ones that are the B version, i.e. 200mhz fsb? >>
The vast majority are, but not "all".
Initial 1.2GHz Athlons were locked, but since then basically all 1.2GHz+ Athlon have been factory unlocked. Your basically about 99% assured it will be unlocked.
Yes it's true for both the "b" and "c" versions.