Car Loan after Chapter 7 Discharge

OK, here's the skinny. In another thread, I indicated that I am filing Chapter 7 bankruptcy. My expected timeframe for complete discharge would be early January, depending on my court date, etc. I was also told that my tax refund would likely not be touched at all (yay!), because I would need it for a downpayment on my next car. I know that a dealership's main purpose is to get people into cars, but I am wondering, what sort of interest rate would I expect, and what sort of monthly payment (hypothetically) would I expect on, for example, a $5K vehicle??
My wife and I did a preliminary budget and by discharge time, we expect to have roughly $800/month savings, so supporting a car payment and the higher insurance premium (because until now, I've been getting liability only, now it would be comp and collision) would be no problem at this time.