Another option, Unobtanium edition: the GT Tachyon. No idea how heavy it was but it was oddball and unique and ahead of its time. They tried to introduce a new wheel standard, the 700d, but it didn't catch on and most of the Tachyons I've ever seen online have been converted to 650b. Also came with Suntour Command shifters.
No idea if it's a good bike of not but I am drawn to things for the oddball factor. Also, they're like hen's teeth.