My personal OM herd runs to the following:

OM1n MD (film advance not working)
OM2n
OM4Ti
OM20
OM30
OM40

16mm fisheye
28m f3.5
3 x 50mm F1.8
50mm f1.4
50mm f3.5 macro
35-70mm zoom
135mm f3.5

T20, T32 and F280 flashes

The OMxx bodies don't get enough use but the rest is fairly well exercised and I love the feel of the whole system - so neat compared to DSLRs which are huge by comparison. OM4 and the fisheye are my current favourites.