Does anyone know what model/year this would be?

I'm still running older 9spd XTR and got to test out a new 10spd XTR setup and much to my surprised - i hated the lever feel due to the dual release with shimano trying to copy sram's shifting style.

I want to go to 10spd in the near future but will not run a dual release shifter - any ideas on which model shifter to hunt after?

Anything in XTR, XT, Saint, Hone, SLX, LX will work