I've heard really good things about Evolution engines. I'd go with the Evo 1.00. It's the size of a .90 and has more power.

If you want a 4-stroke in that price range, you CAN buy the O.S. FL-70 or Magnum .70. The O.S. is quieter, the Magnum more powerful. Both can turn a 14X6 prop, which will make your warbird soar.