trib,
I use the prop adaptor from the Power 46. It looks very close to the scale pointy spinner flown by Don MacLaren. Most WWI planes didn't have a spinner. Just a bolt pattern on the prop. But Mac's did. I painted mine red to be just like the documentation shown in the profile from Sopwith Camel Aces.

The Pro 60 Eflite esc has a switching BEC, and is getting good results. I would go with that one. I use DS821 servos that came with my DX7 radio.

As for barrel rolls, look at the Camel do a nice roll in the middle of this flight footage!

http://www.rcgroups.com/forums/showthread.php?t=785794