Finality, I was looking at Audi's about 4 months ago in the 30k range. For a very rough idea of what the price differences were, if I financed the car for 4 years, the payments would be around $770 a month.
If I had leased for 4 years, the payments would be just a hair under $500. Almost a saving of $300.
This is assuming no money down.
Click
here for the Audi finance calculator. They have several cars in the $30,000 pricerange that you can toy around with the prices with.