If you want an Olympus, restrict yourself to the XA without suffices. The later ones are more auto, but the original XA rangefinder is a great little camera.
I especially like the detachable flash: without flash it fits nicely into a normal shirt pocket.
The only drawback is that you can't attach a filter in front of the lens.
But the XA3 and XA4 are relatively rare and have useful features: one has a 28mm wide angle and the other has macro. The XA1 is to be avoided. The XA2 has a bog-standard Tessar f3.5