I recently bought a Z GT Edition, and being self employed I couldn't get a bank loan at a decent APR as I don't have 2yrs worth of audited accounts yet. However buying the car new, at Nissans 6.9%, coupled with £8k off the list price, made buying new only slightly more expensive to that of buying a £20k second hand car, with the extended warranty package added on, on APR of say 14%.
This is a really good point. There are some good deals to be had if you are a cash buyer and can haggle a bit