I wrote this after a cursory glance at your list and didn't see the other Mott album there. Oops!
Eh, you probably don't need more than one Mott the Hoople album in your life but All the Young Dudes' title track is a classic, and there's an early version of "Ready for Love", one of the better songs on Bad Company's debut. I don't know which album I'd choose (not big on the band in general).
Love It To Death is my favorite Cooper, but is it really glam? The character wasn't that well defined yet. Welcome to My Nightmare is pretty good, not his best, but his most show-bizzy up to that point (and maybe ever). That said, I'd go with Billion Dollar Babies -- my second-favorite Cooper -- and Nightmare if I had to pick two for a survey.