Now, if I had a crystal ball..............
The amount of negotiating, IMO, is up to the dealer. If he wants your business and thinks of you as a good future customer, and is willing to make less money on your 'deal', maybe you can negotiate. But don't think one will find a 'formula' that will work for all or even a few dealers.
When making a better deal, you will need to sell yourself, IMO.
I consider the location of the dealer, how I have been treated there, how he leans over backward for me, how bad I might need him in my future (repair, service, parts, rental or loan of equipment).
My dealer treats me well but I know of others that I think I could get along just as well with, but they don't sell the green paint that I like. If I was to buy orange, there is a fantastic orange dealer that I think I would like real well.
It's just money. The price difference you speak of is not worth losing a good relationship with a potentially good dealer, IMO. Dealers are people, and I treat them like I would want to be treated. I'm happy, and hope you will be too. /forums/images/graemlins/wink.gif