2 of my bikes are SS, I'm converting one more, and I'm leaving my grocery bike with the gears just because I don't feel like messing with it.

I ride my commuter at 44/17, which is 70 gear inches. It's a little tall for a couple hills around here, but I can usually grunt it out and make my way up them. That one is currently also my rando bike and I use it for 100k - 150k rides. If the hills get too steep, there's always the 24" gear; get off and walk.

My SSCX race bike is currently geared 38/18, which is 57 gear inches. It's a good gear for dry, flatter courses or light mud over hardpack. I'll drop it to 38/19 or 38/20 for super mucky or really hilly courses with short straightaways.