Christmas is approaching
Well, there is no rush (presumably?) so I would keep an eye on the other Dakars coming up for sale, especially leading up to Christmas when everyone has their mind on that! Seriously, I have bought some bargain items in the past, right up to Christmas Eve.
Play one dealer against the other in the sense that they will know you are definitely interested in a deal but let them know that you are looking at other bikes - see what they are prepared to do about cutting their asking price, tell them you are thinking about it and keep stringing them along for a better discount on that asking price & see what they might add in as extras (perhaps a long shot on BMW bits and pieces as they are so expensive!).
What warranty will they include?
Then, how do you rate the dealer? Ask to have a look at their workshop - you can get some idea about their work standards in case you are going to use them in the future.
Ultimately, you are the one who gets the feel for what is the best deal; bear in mind that they have to make some profit in order to stay in business!