For a 60 size trainer- do you know how to break in an engine? Do you know someone who flies and knows how to make a glow engine run well? If so the super tiger 60 or 90 engines are excellent values and will give you many years of reliable service. But if you are not into engine tuning then get an OS. They cost more but they are simpler to break in and adjust than the tigers. The 65la has an air bleed carb so the low end needle adjusts the air, not the fuel. but the ones I have seen run well. The the os 61 fx has a better carb than the 65la but costs more.

I am a super tiger fanatic. I have learned to break in and tune the tigers but they are not cookbook engines. however when they are properly broken in with the right glow plug they are the best engine value out there for the money. Either the 61 or the 90 will fly your trainer very well.

Also- I would advise getting a 6 channel radio for your trainer, with decent programming features. the 4 channel radios are cheaper but they don't have many features that you will want after you get past the trainer.

Ed