What's the starting price on the car?

Here's some quick numbers
edmunds.com has the TMV (True Market Value) at 16,700 for that car
Trade In: 4600
Minus what you owe: 3800
That's $800 leftover
+$500
----------
$1300 Down
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$16700
-1300
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$15400 - That's the number you should be financing at the TMV i looked up on edmunds.com, not including tax,tag,title, and dealer fees. They always hide money in the deal somewhere. But then again if I was selling them I would too .
This article is long, but will help you out on buying a car to "beat" the sales MANAGER, the salesman is just a pawn

Confessions of a Car Salesman