Why not a Onex, you don't have to have big tyres and STOL to have fun. It's trailerable, it's cheap, it's got a small fuel tank so you don't have to pretend you're going to do anything other than just tool around, it's delightfully well balanced, easy to land, has the little wheel at the back, you can't fit expensive electronics on the dash, and it's just fun, fun,fun, to fly.