OK from my humble perspective (is everyone sitting down?).
1940 Morris Series E coupe - best little car to learn how to go round a roundabout as fast as possible - even on two wheels. Bigger tires, shaved the head, painted it red (with a brush) and thought I was cool.
1936 MG TA. Nice looking car (also red) that people loved. When I needed a part folk would get or make the piece for me or help out in any way. Case in point: a mechanic friend would arrange for a safety check sight unseen - the car was described as concours - only two packs of smokes. Car was terribly slow however and roundabouts were of no interest to it.
1964 MGB. Previously owned by an Abingdon engineer who modfied the motor - sweet car and was able to apply everything and more that I learned about roundabouts with the Morris.
1968 Firebird 400. Monster car - took my racing drivers school in it. No speed limits in those days....no roundabouts however, but would like to own it now.
Today a Miata and a Cayman S. Both great cars.
Jeff W