James, sorry I didn't get to this earlier. If you are what's considered "a ghost" in the credit world I think there is a 99.9% chance NMAC would not finance you without a co-signer or a very large down payment. Being that a 02-03 3.5 is running $22-23K, that's a chunk of change to put down. That's not to say that no one would. Not very many lenders have 1st time buyers programs that don't include a cosigner but in some cases Credit Unions might. We have a Federal Credit Union down here that has a plan structured like this:
10% of financed amount as down payment1 year on job$12,000 max priceInsurane can't exceed $2400 for total yearMeet qualifications for the Credit Union
http://www.bfcu.org
Also, no true salesperson can give numbers like you're asking. All customers start off the same but all customers end up different. Payments are based on so many different factors including APR which is based soley on your credit and lending institutions' regulations. So you would have to be in an environment where all of these things can be looked not to mention we as salespeople are regulated by Regulation Z and the Privacy Act. So when you go to a dealer, a salesperson can't accept nor authorize any figures.
But I will tell you this, based on average numbers I've seen in the past on used vehicles and strong cosigners a person looking at a vehicle like this could be prepared to pay no less than $400 monthly on a 5 year term with 20% cash investment using simple interest. This may not be your case, but this has been what I've seen.