I own an '87 Allante and love the car... it's a slick looking convertible with great styling.
But, the '87-'89s were a bit maintenance prone.
Things got better in '90, '91, and '92.
Most Allante aficionadoes consider the 90.5 model to be a great car! Not quite as "finished" as the '93 was, when Cadillac began to get it right.
I'd say, if money's an issue get the 90.5, if not, I'd get a good, low mileage '93 model.
Check out the Allante Appreciation Group on the web. They have a great site at:
allante@pointers.com or
www.allante.us
It is certainly a unique machine and will get lots of stares and folks strolling up to ask, "What the hell's that?"
Cheers... Misty145