Being a BMW guy, I'll start with "the driving machines".
1. BMW 501, the baroque angel. 2.1 straight six, 72hp. Preferably without a roof, but saloon also works.
2. BMW 315, 1.6 litres worth of inline-4 power, 75hp. And I'm such a big e21 fan that I won't let the under 75hp limit stop me having one on this list too.
The most fun car I've ever driven.
3. M-B 200D, Naturally aspirated 2.0 inline-4 diesel, 55hp. A Mercedes I actually like, both looks and driving-wise. Go figure..
4. Suzuki Cappucino (of course, the one rather obvious choice)
I was going to do this list with my usual "FWD is evil" -style, but...
5. Saab 96 kombi, naturally with the 38hp 3 cylinder 2-stroke engine even though the V4 with 65/68hp would have also fit the criteria.