I'll kick in my two bits for a '94-'96 Buick Roadmaster sedan which were equipped with the LT1 motor & dual exhaust. A nice option is the the 5000# Tow Package which has beefier springs and a slightly shorter rear gear (2.93) vs the stock 2.56s (by contrast, Impala SSs came with 3.08s). My daily driver '96 Roadmaster Limited sedan came with the Tow Pkg, G80 posi, HD cooling, dual airbags, all manner of luxo toys including CD player, electric trunk pull down, little opera lights that light up at night, etc. Cost was about $6K and that was almost three years ago. I have since upgraded the exhaust and added a CAI (two of the usual Imp SS mods) and swapped out the 2.93 gears in favor of 3.42s which actually helped my MPG a little bit. My plan is to go to 3.73s, which is what I think I should have done in the first place but didn't realize it until after I'd driven a fellow TB.com boardmember's '94 RM Wagon which has 3.73s.
The sedan doesn't have the more pleasing front end styling of the wagon. And, yes it's big (over 4300#). But, it's safe, comfy, and a lot of fun to shock people with when you get on it from a stoplight. Shorter gears also come in handy when you want to pass those pesky imports on the freeway!
At any rate, I hope this helped!
Morgan
'87 GN, '96 RM