If u can afford, get OM3T or OM4T. All have similiar built as OM1, weight and dimensions.
OM3T is fully mechanical version of OM1 with spot metering
OM4T is improved version of OM2Sp.
OM3/4 T or no T, have OTF and flash syn at all speed with F280 flash.
OTF was OM's innovation.
T for titanium body
OTF= Off-The-Film TTL light metering, sensor measures light reflected off the film for auto exposure.
OM2 is AE version of OM1
OM2sp spot metering version of OM2, but with battery leak problem.
OM1 has the classical look, uses Hg battery and metering is less responsive.. shutter flip sounds is rather "seductive".
My OM shots were all loaded at
www.geocities.com/boochap. The scan qualities was lousy, was using minolta dual III last time.