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What kinda plane you gonna be flyin'? If it is for sport flying/speed I would go:
YS-45
Rossi (Powerhouse)-45/53
MVVS-49
Webra-50
OS-50SX
Jett-50 $$
If you want all out speed:
MVVS is the cheapest way to go unless you want to modify a Ducted Fan motor like the K&B 7.5-
Keep us posted!
james