When buying a car, forget finance to begin with.
You must concentrate on securing a good car at a fair price first then decide on how to fund it. Avoid something where the price of the car depends on you taking the finance from the dealer (although there are exceptions to this rule).
If you do listen to dealers and their finance deals ensure that
a) The interest rate they quote is APR and not flat rate (APR is roughly double the flat rate).
b) It doesn't include unnecessary, non-essential and crap payment protection.
and
c) There are no large documentation fees/early settlement penalties.
First off, make the decision to buy a car and then go out and do it. Dealers will normally want to give you any proper details or spend time trying to strike a deal with you if you are not going to buy for a couple of months.
If you have a pen in your hand ready to sign, this is when you will get your best deal....
JJ
You gotta tie yourself to the mast my friend, and the storm will end.