I've had MDS 38, SC 36 heli, and currently TT 46 Pro in my kit built Limbo. The SC 36 was the best engine all round. Good power, throttles great and hovers easily and the CG is near enough. The 46 is great but you get a shorter flight and the CG is too far forward. My Limbo is about 4 years old and still going strong. Use 11x4 on 36 and 11x5 on 46. I think the .32 might be a bit marginal, depends on the finished weight. Mine is 4 pounds dead on the 46. (Yep, plenty of repairs!)

From what I've seen the ARTF version is a bit flimsy, especially the forward fuselage which is full of big holes! You'll have more fun with this plane than you ever thought possible.

EDIT: Meant to say I've always used a 4 cell 600mah NiMh in mine, only weighs a couple of ounces and is good for 6 flights. Oh, and don't even think about the MDS!