My four choices for extreme power would be the following:
[ul][*] Actro 40-4[*] AXI 5320/28[*] Hacker B50L geared[*] Kontronik 600 geared
[/ul]

An outrunner is always my first choice due to the simplicity and low maintenance. Since Hobby Lobby discontinued selling the Actro line due to high price, I will have to wait to have a Seawind in my hands to see if an AXI 5330 has any chance to fit. A smaller AXI 4330 may fit and keep the weight down with only a 6s Lithium requirement. We have many 10lb scale glow conversions using a 4130. It depends on how aerobatic you need the plane to be.

Since the Seawind does have flaps, they will help slow the plane for landing.