I am busy evaluating options for a 3 axis plane... The only problem, is that a lot of them come with Rotax 582 motors, and I am not that keen on flying something with a 2-stoke motor in. Yeah, call me a wimp, but hey

I would like to find out what the costs would be in swapping out engines. Is there a market for used 582's, if so, what sort of price could I expect to get for one (say 200-300 hours)?
What would be my chances of finding a used low-hour Rotax 912(s), or Jabiru 2200? And what sort of prices do they go for? I suppose I would have to send the engine in for a complete check-up on purchase too?
Thanks all!
-justin