I've got a Rikon 70-100, and although it is not a variable speed model, it has been a real workhorse. I have considered buying the variable speed kit for it, but the kit still incorporates pulleys -- you go from 6 steps on my model to 3 with the VS kit, so you still have to move the belt around.
I'd check out the 1216, and see how easy the belts are to move. You will likely find the speed you want to go to is on another pulley pair, and a belt move is required. On the 70-100, the belt moves are very easy, so I am foregoing the VS kit. I'm instead going to upgrade at some point to a real VS model, one that is continuously variable (Nova, OneWay), and requires no belt moves.