IMO, local dealer is worth just a little bit more than whatever the gas and time expense would be to go buy it from the cheaper dealer.
Using our own TT purchase as an example, we found the exact same model our local dealer had for 3K less at a wholesaler half way across the country - so easily 700 in fuel to go get it and a couple off days off I didn't want to spend on just going to get our new TT. To me, it was easily worth paying 1500 or 2k more than the cheap far away deal just to save the gas / hassle. I showed the wholesalers quote to the local guy and we renegotiated down 2K -- not worth 1K to drive half way across the country.
Now, if it where only a few hours / dollars in gas difference, then sure, I drive a little to save more.
One thing I have learned is that any decent dealer will treat you right for service and warranty - whether you buy a unit from them or not.
