I will join the throng singing the praises of the Mazda Miata. All the other cars suggested pale in comparison as far as driving pleasure per dollar spent. I’ve driven several Miatas, and can say that they deliver one of the best balanced true sports car experiences on the road. They are almost bulletproof, and you can get an excellent example for about 15K.
Honda S2000. This seems to be the favorite of the boy racers on the board. Yes it certainly has more horsepower than a Miata, but how often will you be revving this machine beyond 6 grand? The OP sounds like he will actually be driving this car not reading about it in a magazine or playing a video game, and he sounds like he’ll be making the payments. Given the choice, I’d take a Miata and 1000 ten dollar bills, any day, thanks very much.
BMW If the OP wanted a BMW or was inclined to buy one, he’d probably already have one.
Honda Del Sol??? Not a sports car. Front wheel drive 90s Civic with less interior space and a funky roof. Yawn.
**Audi TT ** Certainly available in this price range, but IMHO not a good value, Make sure you’re happy with what you are actually getting for the money: Front wheel/AWD drive turbo Volkswagen.
Toyota MR2RWD and a much better value than the Audi, Though not as nice as the Miata, if the styling really appeals to you, this wouldn’t be a bad choice for an inexpensive newer car. Really lacking in storage space except for small, triangular space behind the seats.
**Lotus Elise ** Yeah Right. Is it finally legal in the U.S.? If so, nice car I suppose, if you have the money to buy one. Good luck cutting a deal on this new-to-market, rare, high performance car. Clearly not what the OP is looking for, so why bring it up?
Old British Sports Cars Fine, but obviously not what the OP is looking for.
Subaru WRX The OP is looking for a 2 seater convertible sports car, not “four door turbocharged pseudo-rally economy car with scoops and plastic doodads all over it”.
Porsche 911 Older ones are great, but IMHO the OP is looking for something newer for his 30K or less.
which brings me to some additional suggestions- if you absolutely don’t want a Miata, and have to spend 30K, I’d suggest a Corvette C5 or Porsche Boxster. Both excellent cars, available as convertibles, and available used in this price range.