Hmmm, just been catching up on this thread and thought I would chuck my two penneth in........now I am no fan of outdrives, I had one on my last boat and it caused me a major headache when the cv boot split whilst in the water (little old Sonic drive) but if the boat was everything else I wanted I would probably put up with them and instigate a thorough preventitive maintainence program to ensure reliability - having it done professionally every year or perhaps every other for 20 years(for example) will surely be cheaper overall than converting. Of course making sure they good spares availability first!
A good feature of a twin outdrive set up over twin shafts is that you should be able to run on one engine without fear of having to stop suddenly as you can steer the drive in reverse to keep the boat straight - try to stop hard on one engine with twin shafts equals a broadside approach to the hazard and brown trousers all round! (There may be technical reason not to run on one outrive though - anyone know?)
The 'stern on' issue may not be a huge problem if the boat has a decent bathing platform and the Princess 32 transom already overhangs the drives to an extent anyway.
Anyhoo, just my musings, feel free to ignore, personally I'm not a big fan of the Princess 32(among others) as you can't see out of the cabin windows very well when below but I can see the appeal, decent proper boats. (Looked at a few generally and one closely with my folks a few years back).