realskiers

dmaizers:

Welcome.  If you want to be able to move the binding around, then the only options are a Railflex setup or a demo binding setup, and I think demo bindings are usually heavier than Railflex. They are certainly clunkier looking (but easier to adjust in some ways).
Also there are some ramp angle differences between various brands, so you should consider sticking with a particular brand if you really liked the stance that your boots/bindings gave you.
I would also recommend mounting 1cm forward since it's a Unisex ski (the whole Jeannie Thoren thing that is now accepted as gospel), unless you have found from past skis that you don't like that.

What DIN setting do you normally ski with.  I would think the LD11 or LD12 would be fine, and those are somewhat lighter than the LD14 (assuming that the DIN settings you ski with is in the 4-12 range.

The down side of the railflex is a slightly reduced snow feel (but increased leverage when edging).

I'm curious, were you able to demo the iM78 before you bought.  I would certainly say that you probably haven't been undersold on this one, and a 78 width will give you a lot of float given your lighter weight.