In reply to maybe_si:
Soft tops aren't cold in winter (there's bu**er all insulation in the typical tin top anyway) and with heated seats you can use them roof down year round. They are a bit noisier which is something I'm rather sensitive to but it's never bothered me in mine.
MX5 is a great suggestion and the old Ka is great fun for what it is, I've never tried a Street Ka but I'd be tempted if I needed another 2 seater. How tall are you? I'm only 6ft but with a very long back meaning I have to shuffle the seats around in most cars to get my head out of the roof. I fit fine in an MX5. Z3 is a good solid convertible and the 4cyl versions should be cheap enough to own (2.2L is the pick of the bunch IIRC). You can get them with a lift off hard top but I really wouldn't bother, much better to enjoy those sunny winter days when you get them. A mark II T-bar MR2 with the lift out roof panels would work but they're getting on a bit, there won't be a big choice. The Mk I is better (brilliant!) but nice ones are like hens' teeth.
jk