Piper Pawnee is certainly powerfull tug, but I am not sure about the price.
In Spain I was towing with M.S. Rallye 235GT, with the same 235hp engine as some Pawnees have. Rallye is too heavy, although it has slats and you get airborne quite soon, you have to wait for the safe speed for climbing. Rallye is very comfortable, but the view is poor while climbing.
In Slovakia and Czech Republic we mostly use Zlin Trener types. Z-226MS is light and powerfull (180hp), but it is not so easy to fly. Since you dont see anything while taxying you must do "snake taxying". The pilot sits on the rear seat so the view is not so great. You have to do three-points landing, otherwise you can start jumping. The main wheel landing is used only for strong gusting and x-wind. However, flying this machine is a great passion. Especially Z-526AFS single seater, aerobatic type. You feel like sitting in the P51 Mustang
Other tow planes: Elster-C (nice to fly), Robin DR400, Husky, Citabria, DHC1 Supermunk...