Fed-X just dropped off my Pulse XT ARF today (thanks Jerry), and now I need an engine. I want to run a 4 stroke if I can (love that realistic sound), and because of the sales going on right now, I'm thinking of either the Magnum XL 52 RFS ($119) or the XL 70 RFS ($129). Being a newbie to both flying RC and to 4 stroke engines, I'm wondering which would be the better choice for this plane and for me (as a new flyer), and why. Or would I be better off going with what seems to be the popular choice, the OS46AX 2 stroke? Thanks.