Ive gone from a 300bhp impreza to a gen 7 140 and to be honest i can have just as much if not more fun in the celica. Dont get me wrong the impreza was an awesome car but the gen 7 is now starting to feel just as much fun. Add to that one of the worse points of the scooby was putting fuel in every other day. If you are worried about it not being fun to drive then get one, do a few mods and drive it, best to regret something you have done than something you never did. Other problem is its impossible to speed anywhere now so the quicker cars are not as much fun as you spend most of your time looking for the plod.
P.S thats just my opinion