Hmmm this is a tough question, 200 million is an awful lot of money and 3 cars so very few if I had so much. However, I think I would initially do the following;
1971 Plymouth Barracuda with the '440 7.2L V8 coupe (a 1971 '426 'cuda Convertible would be nice too, but only 11 of these were ever made, so even with 200 mil, I wouldn't be optimistic about acquiring one, after all I wouldn't spend silly money)
1965 Shelby Mustang GT350 '289 (I prefer the 1965 body style, to the slightly fater more aggressive style used for the rest of the '60s)
And I guess I need something more modern for every day use. So the new Camaro SS '376 6.2L V8
I thought about going for the late '60s Camaro SS over the Shelby GT350, but really I have to keep the GT350 in there, it's one of my favourite cars of all time. Of course I would buy some seriously expensive and fast super cars aswell with so much money, but if I had to just have 3 cars, I must go with my favourites first, and these are right at the top of my list of cars I most want. The 1st generation (1966-1970) Oldsmobile Toronado with the '455 Rocket V8 is also a serious contender for this list, imagine a 2 door coupe that is almost 5 and a half meters long

...I'd love a fourth generation Chevrolet Impala SS aswell. Gahh the choices!
