Well, generally rotary engines lasts about 120K. But, I've heard there are rotaries with 200K and down side of months after rebuild.
Depends on your driving habits and maintenance.
Turbo itself on the other hand, it has approx 70-80K life in general.
The fact that you must bear in mind is you're looking at 10+ yr old car!
Lots of TLC should be given as you would do to a piston engines.
Yes, venturing into "unknown" is scary and it is. But, once you learn rotary, you'll be sure that the way to go!