If you don't mind manual everything, a Kodak Retina IIA would be awesome. If not, look at a Yashica T4. Terrific little camera with a Zeiss 35mm lens. Or a Contax T/T2. The T/T2 have full auto ( I think the T2 has aperture priority as well), fold up very compactly, and a brilliant Zeiss 35mm f2.8 lens. The T is more compact because the flash is detachable, much like the Olympus XA.
Here's one that's not cosmetically pristine, but still in GWO, at a reasonable price. The T2s are selling for a lot more than you're looking for on Ebay, but that may not be an accurate indicator of real world price.