For that spec, I think I'd look to something a little more capable than a C150. At the very least a C172 PA28 or BE23, but you could I also agree look at what's available in the experimental category.
Best thing is get there, get to know the local flying clubs, and ask around - the locals will know what are the good aeroplanes available for the sort of flying that you want to do.
But the basic principle of buying a basic aeroplane as personal recreation and transport for the 4 years you'll be there - good idea. Although again, once you're there, you'll have a feel for what the local rental availability is, and it's worth scouting that out before you commit to buying.
G