I get what you mean. The Golf is our fourth VW in the past 10 years, and three of them (including the Golf) were from the dealer 15 minutes from our house. Partially for convenience, but also because having dealt with them before, they shoot straight (mostly) with me. I did buy the previous VW (Jetta) from a dealer about 45 minutes away but you are right--any dealer service area will service your car. Whether they do that competently or not is another story discussed in several other different threads. But I digress. The dealer that services your car will be compensated for warranty work (and the care-free maintenance if you decide to use it) by VW. So the competition for parts and performing service is different from the competition for your initial sale. I would treat them separately. If you find one dealer in your area has the best tech service for warranty/service, I wouldn't hesitate to go there even if the sales dept didn't sell me the car initially.
There is a pretty detailed explanation of the "normal" order process on the first page of the Ask A VW Salesman thread. Unfortunately, the normal 2-3 month process of ordering a car to spec hasn't applied to the Golf, where dealers are getting maybe 1 or 2 allocation slots a month to use on ordered cars. Dealers who have been taking orders since June of last year probably have a nice backlog of ordered cars. Other dealers like Langhorne apparently stopped or did not take orders to avoid the situation of frustrated customers waiting 6 or 7 months for their cars to be built and delivered. Seems like that is easing up a bit as folks who placed orders mid-year last year are finally starting to see their cars being built, or have had their waiting list shortened by customers buying launch cars instead. Whatever dealer you end up with, you want to ask if they are still working on a backlog of unallocated orders and if so, where you would fit in as far as potential delivery. If they don't have a backlog and they know they'll have open slots for your order, you may luck out and have your car built to order in 2 to 3 months.