I'm in the process of giving 1x a crack too, and have settled on 48 x 11-32.
It give more or less the same total GI spread as 53/39 with 12-25 cassette which I've currently got on one of my road bikes.
But, YMMV and of course will be subject to your local terrain.
I've ordered an 11-32 cassette.
What size front ring should I go for?
I'm thinking a 46, which should give 40mph at a 120rpm downhill spin and 6mph for a 50rpm uphill grind.
Thoughts pls.