Welcome to Alfa ownership, but be warned: ALFA stands for Always Looking For Another. :grin2:
Not really... but based on what you tell us about yourself, I suggest a nice, well cared for series 4 car, 1991 to 1994. I have a '91 I bought new, and it has never once let me down on the side of the road. It has the Bosch Motronic engine controls, power steering, various refinements over the series 3, and could even be had with an automatic (although they are not common).
There's nothing at all wrong with the S3 Spiders, and the suggestion to get a 1990 model was a good idea also, but again-- based on your statements, I think you'd be happiest with the newest Spider available. The Alfa Romeo Owners Club (
AROC | Alfa Romeo Owners Club USA) and the good folks on this forum can put you in touch with someone, hopefully near to your location, who could possibly help you in the assessment of a car you find for sale.
But please, please be aware of this: You do NOT want to allow anyone unfamiliar with Alfas to tinker with or "maintain" your Spider. Alfas are somewhat conventional in some ways, but unconventional in design in other respects, and they do not suffer fools with tools very well. They are durable and extremely well engineered, however, for their time period. Just check the oil regularly, take care of it properly, and you'll enjoy the ownership.