I own three TT Pro-46s and one OS 46FX. Both would make an excellent engine for your trainer. I own more TTs simply because they are significantly cheaper and perform just as well as the OS. Another engine to consider would be the Irvine MK3 53. It's more powerful than all three 46s you mentioned and weighs only an once or two more.

In terms of props for this sized engine:

Speed - 9x8, 10x6, 10x7, 11x6, 11x7
Vertical - 11x4, 11x5, 11.5x4, 12x4, 12.25x3.75

Probably the best all-round prop for a 46 sized engine is the APC 11x5.