My personal driver is now a 2000 DeVille. Picked it up with 100K for $5800. Runs great, looks better...but the vibration issue over 65mph is something GM should hang their head in shame about.
http://www.carsurvey.org/viewcomments_review_19040.html
Have to clear the SES P0420 and get the center mounted LED brake light fixed...but other than that an OK ride so far.
1990 Seville with the 4.9 liter - indestructible, reliable.
1986 FWD Fleetwood - Milkshake Motor need I say more.
1981 Seville Elegante Diesel - slow but reliable once they replaced the engine with a new factory one.