I'm looking for advice from all you seasoned RC pilots out there.

I'm planning on getting the World Models T34 Mentor because I've heard it is a great low wing trainer that offers basic aerobatics. My dilema is what engine do I use? Basicaly I don't need a barn storm'in speed demon, I want something that will give me good flight performance with the abilty to do basic aerobatics and pull myself out of trouble if the need arises. The engines I am looking at are:

Megatech M46 with 1.47 hp @ 16,200 rpm
Thunder Tiger GP-42 with 1.10 hp @ 16,000 rpm
Thunder Tiger PRO-46 with 1.43hp @ 16,000 rpm
O.S. 40LA with 1.0 HP at 15,000 RPM
O.S. 46LA with 1.2 BHP at 15,000 RPM

I would like to keep the cost of this plane down so I would like to spend as little as possible. Any suggestions would be great. Thanks everyone.