There are really few things to add to all the good advices above, so instead I'll tell you my story
🙂
Well, my baptism with FSU rangefinders (and with rangefinders in general) came from Jim Blazik's site:
http://www.geocities.com/fzorkis
Todd, take a look at the pages on FSU rangefinders history (for Fed and Zorki cameras) and also at the favorite shooters section, it's really well written, fun to read and informative.
Indeed, I've been almost following his favorite shooters line, by acquiring firstly a Fed-2 from Anya, then a Zorki 3M and a Kiev 4am directly from e*ay. I've been lucky enough to get 3 hits out of 3, and they all keep working well to the date. Lately I've acquired a couple more Kievs, 'cos is a model I like a lot, and being just serviced by Oleg, they perform really smoothly.
It's difficult to recommend a 'first' one (if you end liking it then you won't stop getting more and more
🙂 ), but probably the key is getting a good one from a reputated seller and as Laika said don't try to save $10 for a bargain as you get what you pay for.
I'd like to try a Fed-3 someday (either the a or b version), but hey, you must leave something for the future
🙂
Good luck with the selection ! Remember also that on most knob wind cameras, you must wind film (and hence cock the shutter) before changing shutter speeds, it's sort of a 'gremlin' rule (don't feed them after midnight!).
Oscar