Just get the IS shocks, rides great, doesn't leak after a couple years.

I asked the same question recently, it was suggested that the IS shocks were a good and economical option. I was prepared to drop $500+ on a set of progressives but if a set of IS shocks can be had for about $100, why not try it. I got a set from a member here and put them on a couple days ago. They are definitely stiffer, which is what I wanted. The stock tourer shocks were bottoming out on big bumps/curbs/dips when riding 2 up. It's been raining here, haven't had the wife out with me yet, but I have them set on 3, my tourer shocks were set on 4, they are much firmer. I think they'll do the trick.