ATM, my race combo of choice is a RRalph 2.1 up front, and a Conti Twister supersonic in the back, both with 1 scope of Stans and no rimstrips on ust rims. Have yet to have a flat since January after multi training rides and 6 races this season.
For less specialized trail riding but good all around light performance, I'm running a Jimmy Light in the back, with a Conti Explorer Pro up front. Run with light tubes on 317/vxc rims. Get flats here and there tho. I'm reeeeally getting to hate tubes.