As others have mentioned, the S2 is a great camera. I would add to the list of things to look out for mentioned above the following; clearness of the viewfinder (if it is too green, it will probably only get darker); also, check the film advance lever. After winding a frame, it should spring back without stalling.
Price-wise, as others have mentioned, you can probably find one for a bit less. Of course, the S2 (or any other Nikon Rangefinder) is fun to use and will definitely make a fantastic conversation starter with anyone who admires classic cameras! Not that a Leica M (insert number here) won't attract attention, it's just that there were less Nikon rangefinders made, and they look so much cooler (especially the early ones with the original Nikon font; the ones with the curvy "N")! 🙂 (sorry, just my humble, biased opinion)