I've got an OM1n and an OM2n and I love them (I've also had an OM2S, which is also nice - having spot metering especially - but I sold it because it was a very heavily used and bit creaky). They fit really nicely in my hands (I've got quite small hands) and just feel right. If you were going to get either, I'd probably recommend the OM2n, mainly because it uses SR44/LR44 batteries - the OM1n uses a mercury battery that you can get any more (I've had mine converted to use SR44s, but it cost me about £50 - $100). But on the other hand, the OM1n has a mechanically timed shutter and the camera will work with no battery (you just won't have any metering).
I've also got a bunch of Zuiko lenses (24/2.8, 28/2.8, 35/2.8, 50/1.8, 50/1.4, 100/2.8, 35-70/3.5-4.5, 75-150/4, 100-200/5), and I've had and sold others (21/3.5, 24/2, 200/4, 35-70/4, 35-70/3.6, 35-105, 65-200 - I settled on my chosen kit by just buying stuff, deciding what to keep, and selling the rest), and they're all superb - I reckon they're every bit as good as contemporary Nikon and Canon lenses, and they can be had pretty cheaply. And I prefer the feel to the feel of Nikon and Canon lenses, because they're more compact - and I like the fact that they have the aperture ring at the front.