Welcome aboard Tim.
It's always difficult with used cars I'm afraid regardless of the age or mileage.
I once bought a my96 JDM Impreza WRX with an apparent 66K miles on the clock, ...as it was an import car there was literally no history with it whatsoever. I took a long time examining that car, looking for smoke on start up, checking for leaks, checking the condition of fluids etc etc. I bought it and just a month later driving home from a car show the big end went after the oil pump died starving the crank bearings/engine of oil. No mechanic in the world could of foreseen that happening.
My old 2003 Nissan 350Z however had over 80K miles on the clock when I bought that. I checked that car over myself again in just the same manner but being a UK car it did have some history although by no means comprehensive.
I never had any problems with that car and heavily modified it in the end to over 436Bhp with a Vortech supercharger.
At the end of the day try to look the car over as best you can treating it just like any other used vehicle. Don't get too excited and make sure you check the cars history as much as possible. Some good guides/tips in the threads below...