i just got rid of my 1995 deville and now have a 1995 fleetwood brougham.
the deville interior was MUCH bigger, the fleetwood seems more cramped and has a longer dash. BUT, overall the fleetwood is about 2 feet longer.. go figure!
as for the northstar, i do agree that i've heard Nothing but bad(headgaskets mostly). BUT my deville was not a concours so it came with the 4.9L pushrod(looked nearly identical my 1990 Eldorado Biarritz's 4.5L)
to make a long story short, the Northstar is plain out faster (rated at 300hp) but lacks in the low-end torque compared to the 4.9(rated at 200hp)
my 2 cents? i put BOTH of those (4.9 &4.5) caddies through absolute hell and back, Always drove them Extremely hard.. kept up on oil and NEVER had a single problem.(i've always ran Rotella in All my caddies)
sure they're front wheel drive, but if you're not looking at crazy performance and the price is good... could be worth seeing if it's a 4.9
and yes, you'll find yourself more at home at www.cadillacforums.com
oh and if you wondered why i "got rid" of the deville,
originally my buddy accidentally drilled into the main interior harness during an installation, took me 6 months to find a new harness, 11 hours for us to change the entire thing and .002 seconds for her to fire back up and purr.
then not a year later she met some black ice... and a tree, fence and pole.
but i can say with a busted manifold, no coolant & one hell of a whack on the front end, she started up and ran smooth without the slightest problem. but with frame damage and a nice fat check from insurance... i finally got my dream car
sorry, got sidetracked