Most of my prints these days are between 75 cm and 100 cm wide (39"). An increase in quality is of course always welcome which is why I've been eyeing the 5DmkII.
Then, the easiest would be to get a pano head and dive into multi-row panoramas, with a good stitching program (PS/Photomerge is convenient but has sometimes erratic results ; PTLens, or even Higin, are good ones).
Not more a hassle than fiddling with TS lenses, I'd say, and the IQ gain can be much higher, or at least easier to predict.
As said, so long you stay with a single row, hand holding works well. My panos
are all done this way (I didn't go into multi-row as I only got a 13" wide printer).