All the RZ lenses are good, but some are better than others. I'd sell the 127 and get the 110 and either the 65 M/L-A or the 50-ULD. Both are superb, just depends on how wide you want. The 75 shift is nice, but really requires a tripod to maximize it, and it only shifts 20mm at most, so maybe 1/3 of the frame, if you can picture that. Not a ton of shift but probably enough to correct a 2-story house converging verticals. It's heavy and somewhat long so can be unweildy hand-held (though doable in a pinch). 50 and 65 (and of course 110) are really pretty easy to handhold.

-Ed