Internal hub gears have two issues; expense and weight. I still like the simplicity and "hackability" of a derailleur system. A contender might be SRAM XX, 42/28 x 11/36 gearing with whatever SRAM gear shift you like.

https://www.sram.com/sram/mountain/family/xx

A Shimano Deore set up is hard to beat and you have lots of choice between triple and double cranks, cassettes, hubs etc.

Or you could get silly and go for Shimano XTR Di2

Shimano XTR