If you happen to be looking for a really cheap one, my recommendation for R50s is a Cooper facelift from 2004 and up Base models a have a detuned engine, longer gears, no sports seats and they cost about the same these days.
And you want to avoid pre-facelift cars because of the shitty "midland" 5 speed, later ones have a more solid getrag unit
The only significant option is the panoramic sunroof, wouldn't recommend because there's no built in shade

>>28453569
Same people that call an ND MX5 a "boat" I guess
I think it's about 50-80 kilos worth of extra sound deadening and a few more standart features and independent rear suspension over a regular subcompact of that era because it was marketed and priced as a "premium" car. An R50 Cooper is 1075kg, a Twingo GT about a ton for comparison
You should definitely take one for a spin some day, the driving experience is the best part