RE: '96 Fleetwood,,, '96 Roadmaster... or '97 Town Car?
Couple of things when considering a Roadmaster (my extended family has a few of them):
1. LT1 Roadmasters are fast. Not kidding here. Sub 7 second 0-60 times.
2. After 30k, all the interior parts rattle like crazy over bumps. Better interior *features* than a Caprice, same interior *quality*.
3. Do NOT get one with Dynaride (the airspring setup) take the M8 problems and issues, multiply by 10, then make the car really scary in the corners. When the parts wear out, it's really hard to keep the car between the lines going straight as well.
4. The seats are great. Wonderfully confortable.
The other cars I cannot comment on, only that the Fleetwoods have a longer frame (more rear legroom) than the Caprice and Roadmaster, most if not all have a huge number of optional features already installed, and are absoultely HUGE cars. I have abunch of experience with the Roadmasters because three of my older relatives have one, and two others had one. All were/are well-maintained, some still have very few miles, others have over 130k. I've driven most of them, turned a wrench on them too, and even the low mileage cars have that scary air-ride issue. I rode in a 1992 Limited model when it was brand new, and the ride was beyond awesome though. As someone mentioned above, styling leaves a lot to be desired.
Sean