Ironic how we sell cars and then regret doing it.
Clio V6 - Great Car but felt like it needed another 100bhp. If i still had it now I'd have supercharged it. But at the time I couldn't afford to do that.
BMW M5 - At the time the later E60 V10 had come out, and I felt the E39 M5 was looking dated, now it's a classic and good ones are making big money.
Cosworth - I owned it for 12 years and it was very low mileage, but I'd gone as far as I could with it at the time (430bhp) and she was a garage queen and I needed something more usable and purchased the M5.
There are others too, but I didn't have pictures when I made my initial post....... TVR Tuscan - Always worried it was going to let me down mechanically...... But she never did, worth twice what I sold it for now.
Ahhhhhh.......... The life of a petrolhead.