Mercedes 300SL Gullwing. I mean, I should probably say Ferrari 250GTO, because I could enjoy it a while, then sell it and buy basically every car I ever wanted. But I don't know if I could part with something that pretty, and that's SO valuable I'd be afraid to drive it anywhere. If I couldn't pick the gullwing this is a hard question. My other dream car is a Mercedes W113 SL, or a Citroen SM or DS, and I've recently gotten obsessed with Lotus Europas, but I feel like I should pick something I could never afford, and those aren't that out of reach. So ... McLaren F1 would be awesome. Or, a Tucker 48! Lamborghini Miura or Countach, Ferrari Daytona is a gorgeous car or the BBs. Or maybe I'd try to find the Jaguar XK150 DHC my dad sold before I was born (if he even knows the serial number of it). I feel like I would lose my mind because there are so many awesome cars.
If I had to buy something brand new, I don't know ... not much new interests me as much but I'd probably pick a Mercedes AMG GT C.
Honestly my dream car is actually finishing the restoration on my car and driving it again.
A Bhugatti (I doubt if that's how you spell it) I once saw on Topgear. It could do 280 miles an hour and was worth a million or more. If you couldn't drive it on the road you would get a good price for it. It was a fantastic car.