The L-Jet and Motronic cars (early 80's to early 90's) are pretty reliable. Apart from maintenance items, I work on my wife's '88 less than the others.From a reliability point of view, parts availability and performance the S3 spider is the one to look for. Best of all is the 90 Spider with the S3 body but electric cooling fans and Bosch Motronic Engine management, with low back pressure exhaust manifolds, hotter cam and higher compression.
Easier to find and pretty darn close is the 85 to 89 Spider, it has monopod inst panel and ECU activated VVT.
Look at the Toronto section of this BB for all the info you need to know if you want to bring an Alfa into Canada.
Best regards, Elio (Bin there done that in 2004!)