Ive got a few 1/24 and I think one 1/18 Corvette but thats it for the larger cars. Mainly I collect 1/64.
Some of the 1/24 and 1/18 on the market are incredibly detailed and very expensive. I looked at an AC Cobra my friend has and theres a ton of detail on it. I think its a Franklin Mint. It even comes with a cloth for touching it.