I would also suggest avoiding the 944s if your wife has a bad back. You may want to look into a set of shocks that are made to your riding style / preferences. JRI and Ohlin are a couple choices - just be ready to pat for them. There are a few members here that run them, hopefully they'll chime in with their experiences.
Also, what are you riding? There is a substantial (IMO) difference in the passenger comfort between an Ultra and a Custom.
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2004 FLTRI - Custom Paint: Glacier White Pearl & Vivid Black with Blue Flake, 12" Buky Malos, Dragos Dragula, Monroe DIY Air Shocks
2001 XLH1200 - Black & Chrome