I think the 108 would be good. It's not too heavy and you have plenty of room to move the battery around for balance.

At a guess I would think a 16 x 4 Wideblade would be the prop to try, perhaps going up to 17 x 4W if the revs are too high.

I think a 91 twostroke is spot-on for this model - I used the MVVS 91 because it is very light, lighter than many 61s, and it produces loads of low-down power.