rtn9105.... im the proud owner of both the ucd 46 and 60 size and i do agree with Barry about one thing, both these Do's are the funest planes ive had but i like the 46 better, for me(may be my elevation) but the 46 does all the above mentioned manuvers better, and i would put the 100 in the 46, it is NOT overpowered but powered just right
after flying my 60 size for a few months and now flying my 46 for only 4 times this weekend and flying like i did before the big CRASH, im sure i like the 46 the best now
if you do go with the 60 size you will not be disappointed because it is also a great plane, but i agree with barry on this one also, i had the 100 in the60 size and its not the engine for the 60, the saito 125 or the ys 110 are the best engines for it
good luck and get that next plane and let us know how it goes!!