I can speak to your last question best: Yes, Axiom is accommodating to special orders. Just call them up; don't try to do it through the website. It will probably cost more to get a high gloss finish; from what I know, that takes a TON of extra coats and they do all of that by hand.
I own M80s and have heard M60s, but not anywhere near the same time. I think you would be happy with either one. The M80s are admittedly more aimed towards high volume. The rooms my M80s have been in are all fairly large; 18x19 or thereabouts. I think my current room is bigger, but I haven't measured recently.
I am the Doctor, and THIS... is my SPOON!