tom,
If your SOPs allow for hands on flying then that's great. As you know, jets don't spend much time in the weather, but, history has shown that wx in the terminal area is what takes them out. I have found that a t/prop pilot has a much more awareness of wx as they are exposed to it a lot more.
Many jet operators SOPs actively discourage hand flying. This is a shame IMHO.
If the original poster has to pay for a rating to fly a jet versus not pay for a rating to fly a t/prop I would suggest he goes for the t/prop job.