I've found that OS engines hold thier value better than most. If you find that R/C isn't for you you'll get a decent price for a well taken care of OS engine. Nothing wrong with buying a good used R/C engine from *bay or here on RCU.

I've had good luck with the OS engines that I've bought. Customer Support and Service is very good if you ever need it. (I've never had to send an OS engine back for any warranty work or service)

Whatever engine you decide on, use a good quality fuel with some oil in it...