I just added my other three possibilities: A East German Trabant with a Hayabusa motorcycle engine swapped in, a cheap 4x4 truck, or an original Mini from the 1960's-80's. The Trabant has been covered in other posts, but it is basically a microcar made with a steel shell and a body of plasticized cotton waste. For a cheap 4x4, it would be a K Blazer/Jimmy, Dodge Ramcharger, Ford Bronco, Jeep Cherokee or CJ, Isuzu Amigo, or Suzuki Samurai. The Mini is wonderfully small and can be swapped to a Honda B16 for a 1400lb car with 160hp. Yes, FWD, but what a fun thing it would be. Even stock the handling is amazing. Plus it is one of my all time dream cars to own.