If you are planning to buy the 9xr pro with frsky module, it will cost you around 150$+ including everything. If you are buying this as a one time investment for a few years from now then buying the taranis would be better in my opinion for the stretched price 20-30$ more.
If not get a 9xr with frsky module, and save a little to buy receivers in the future. I would have done this if i was in your place.