If I were buying one again I would opt for a clean SL2 and budget for service. The downfall of the wonderful finders in the SL and SL2 is that the finders can yellow and spot with age, and I think only repairman Don A. Goldberg can rectify this (in the USA), expensively. Buying one from eBay, the sellers will suddenly lose their ability to accurately describe what a finder looks like so you have to take a crapshoot or buy from an upscale, non-idiotic but honest dealer.
The other issues are that the fastest shutter speeds don't really work and sometimes jam (so don't use them) and the plastic lens release and the slotted film catch device can be brittle with age. Have the repair person replace those parts with the later metal versions.
And you have to figure out what to do about the old Mercury batteries.... endless threads about this. I used a CRIS adapter
http://www.criscam.com.
The good news is that you can save money by buying the older two-cam Leica R lenses. This is also widely discussed, but in general it is best to get good haze-free lenses of the same vintage as the camera body. The single cam lenses are for the original diesel Leicaflex Standard. The 3-cams are for the R-series, the ROM for the later R cameras.
The later R6, R62, R7, etc. are quite nice too. The ones to avoid are the R3 and probably the R4 since the electronics seem to fail after almost 30 years - but if they're still working, knock on wood.
The 28/2.8; 35/2.8; 50/2; and 90/2.8 in two-cam vintage are relatively inexpensive and good performers. They have the same "Leica look" as the M-series lenses. I particularly like the rectangular hood on the 28, it is pretty lens and camera combo.
Shame I find it hard to really shoot 35mm film ;-p
