Regret selling an Aston Martin DB6 that I bought as a rebuild job when I was 18... trouble was that even though the car was cheap to buy it was very expensive to buy the parts to rebuild it... so had to sell it after 8 months to a buyer who had deep enough pockets to complete the job... also regret selling my Pilgrim roadster that I built after the Aston... it now graces the autobahns of west Germany... the only car I really wanted shot of was a VW Golf which turned out to be far thirstier than expected plus the service bills were out of touch with what the car was... I found the BMW 318i was cheaper to run, fuel and service...