I don't think you will be dissapointed with any of the combos you mentioned. I am training with a Kadet senior myself with a TT Pro .46 I can say with confidence it can withstand abuse and flys nicely even in fairly high winds.
The OS, AX and Fx motors are nice as are the TT Pro.
I have an OS .32 in a Hirobo Shuttle and am happy with the peformance of the OS engines.
The Pro 46 in my trainer is a dream motor, it never needs tinkering, starts easy and runs like a demon.
The Futaba flight pack is good but I see no difference in performance (at least on a trainer) of the Hitec flight pack and it will save you some cash.
Best of luck.