[cmyk]

You're getting rid of your BMW due to reliability concerns....and going to Audi??? That's a bold move.

As far as selling price, that largely depends on the market in your area. Check Edmunds and AutoTrader (or even Craigslist) to see what comparably equipped cars are being listed at in your area and use this as a starting point. Just remember that listing/asking price is not the same as selling price.