Hey Noah, thanks for joining our gang of misfits :-D
Are you planning on cx / off-road use with this bike, or is it just for riding on the road?
All trail use. About 50/50 fire-roads and single track. Most of the trails around here are either climbs or descents - very little flat. Many of the climbs are 1500-2000 ft and I'd like to have a gear that allows me to make these. I see WI makes a double freewheel (Eno DOS) with 16/18 or 17/19 combos. Leaning that direction.
I think you're on the right track with the DOS freewheel. If you want real versatility, get the DOS Freewheel in 16/18 and pair that with a 34/32 ring setup on the front.
You'll have a good spread of a stiffer gear for fire roads and lower for singletrack while keeping the same chain length.