Recommendations of ragtops please

[Cullers]

Last year I had my Boxster scammed off me (long story).
It made me love the convertible world and so, I am getting another one but have got a few in mind but I'd really appreciate feedback and advice on what to get. The cars one my list currently are:
Audi A4
Audi TT
Mercedes CLS
Mini Cooper
and
Saab 9-3

I've not put down engine sizes as I'm more flexible on this in terms of size and even fuel (petrol or diesel)
Any and all advice welcome and appreciated. Btw, I'm a 56 year old ex-services with a back problem.

[Cullers]

Thanks for all the suggestions and help. At the moment all I can afford to spend is about £2500. I have had to finish work due to spinal damage so I'm just on my military pension. I could save up for longer but then I'd have no transport for longer.
I had considered the C70 and like Volvo but when I read reviews it wasn't very positive. I'd love a BMW 6 series but financially, I'd have to settle for a single wheel lol.