If you had all the money in the world, what car would you like to own. I mean there's no limit as long as it was produced at some time in the history. This is mine: the 1987 Porsche 959.
I'd get the McLaren, drive the shit out of it for a few weeks. Then sell it and buy:
'02 R1
a boss 429 for my '69 Mach1
65 convertable GTO
68 Chevelle SS
A Viper, so I could crash the overpriced peice of shit and laugh about it.
'57 Bel Air
428 SC Cobra with the sig on the glove box
and a house