Thanks for your reply, Eric. I'm interested in hearing what owners are experiencing as far as ongoing costs are concerned.

Insurance, tiedown, fuel, oil, etc... are easy to predict (I have them already). I plan to keep the plane for 300 hours give or take, then sell it, hopefully recovering the majority of what I pay for it. I can afford routine service, but it's really going to hurt if I have to replace the engine or have it overhauled.