I generally agree with Erik but if you need to choose from those engines I'd put a 55 AX into the DB and Atlas if built light. The Curare and Banshee, if built with foam cores and retracts could stand a slightly larger engine like the 65AX. 75's and 90's are overkill IMO but you could go with a Jett 90 or 100 on something like an EU-1A or other large model.

David.