How many cars do you know are FWD with equal length driveshafts? Very few that I can think of were ever made that way?
Your descriptions of what you would like are pretty similar to a late 80s/early 90s Buick LeSabre. I recommend you find a clean one.
To be honest, I think you are in the minority. It's too bad for you that GM/Ford/Chrysler stopped keeping a design for ages, because I think you would like to live in the aforementioned time frame based on your likes/dislikes on various threads...