Jim, good to hear you are the real deal, I wasn't joking about the investment types by the way, I've even had phone calls out of the blue from guys wanting to know exactly what to look for in a particular Enfield because "I know nothing about classic bikes"! I recommend joining the Interceptor Owners Group
http://groups.yahoo.com/group/RE_Interceptor/ and introducing yourself, explaining your wants. Most of the regulars (who are easily the most knowledgeable Inter Owners anywhere,) are in the US or Canada where most of these bikes currently are and have good tips on bikes for sale, including known "hounds" that re-surface periodically and advice on which Classic Dealers to use and avoid. Look also at David Blasco's Blog
http://www.royalenfields.com/ which is not only gently entertaining but he keeps a regular listing of REs for sale in the US, including Interceptors and Indians (REs badged as Indians from the 50s). Also, have a chat with Allan Hitchcock, bikes occasionally come up with them (although Allan is doubtful that there will be many bulk buys in the future,) but you should register interest anyway. Finally, don't neglect the 1A, it has most of the advantages of a S2 but is less well known and therefore slightly cheaper. I happen to know of one recently imported which sold for (about) £6k running but unrestored and unregistered. Full details of work needed yet to be given! A fully rebuilt (to a high spec) S2 recently went for £10k on Ebay and I think these prices are typical in the UK. Lastly, the much vaunted smoothness of Interceptors is variable, especially on late models, it would appear the crank balancing man had quite a few days off! I would say an engine rebuild (at least strip and inspect,) is vital on an unknown bike but needn't be too expensive with parts from our Hosts. A crank balance will be about £150, plus parts if required. Hope this helps, see you at the Inter Forum? Oh, and, RE Owners Club Interceptor Rally is at the Cotswold Farm Park near Stow on the Wold 21-23 June, day visitors welcome if you're not a Club member, lots of bikes to admire and interesting folk to get tips! Hope this helps,
REgards, Mark