Kari~
If you finance another car, don't go through the dealership. Talk to a bank or better yet a credit union first. Credit unions are alot easier to work with and almost always will have your best interest in mind first.
Find a vehicle you like, can afford, best suits your needs and not wants and then take that information to the bank/credit union.
Going through your own financial institution first will get you a better deal all around.
Good luck
Mike