Why would you buy an Audi? This is a Jaaag forum
Done most Rally, Track, Supercar experiences out there being a lucky and motorsport hungry kinda chap.
The best by a long shot though:
https://www.motorsport-events.com/pages ... rp-karting
Taken part twice and learnt more than any other event to hone driving skills
Not cheap, but like everything, 'you get what you pay for'.