I guess the Norvel is ok if you get a bigger carb, but if you are going to change it from stock, the Fora with an rc carb would be wicked.  The Magnum XLS is about the best bang for the buck, and I still like the OS LA for piddly planes but would only buy a used one in good shape because they are way overpriced for what they are.  The LA is actually pretty good considering it is a plain bearing non scheurle motor.