I'm the same height as you and a friend of mine has a medium ice cream truck, which fits me well.
Is the lack of appeal for alum due to harshness? If so, the fat tires imo really take away this factor.
The Minnesota brand "Framed" has some good models, I got one for my wife last winter, good bike.
Look into them if you ever change your mind on aluminium.
I get the steel thing, I've had a Troll for years and it's a great touring bike, I've spent months and months on that bike touring. I just find riding on 4, 4.5 inch tires to make such a difference to ride quality.
Anyway, just an opinion.
Thanks for the suggestion, I had looked at the Framed MN, but really it comes more down to aesthetics. The Framed also seems to be more limited as far as upgrades & especially bottle bosses, etc.
I also ruled out the ICT due to the increased q-factor which may or may not be an issue for me. I also don't need room for the larger tires.