The Mirex + Mamiya macro combo is definitely the way to go: it's better and much cheaper than a new 90TS, and lets you use any (cheap, but superb) Mamiya 645 lens as a T/S. I rely heavily on my M645 35mm, 55mm, 80mm and 120mm lenses – all have 15mm shift movements and 10° tilt . . . again, better than any of the Canon versions.