Crank powermeter for a fat bike, (single chain ring)

[cetuximab]

I want to build a full susp fat bike.

The frame I am looking at requires 120mm BSA crank.

Never had a powermeter. I just downloaded training with a powermeter.

The powertap is only available with a 160mm rotor, so I decided against their hub powermeter.

So, thinking about a crank located powermeter. I like my single chain ring bikes. I have 1x10 and a 1x11 that work flawlessly.

Any recomendation?

Thanks