Having ordered a vehicle via the dealership experience I can say that I prefer a relatively stripped "off the shelf stock" modify it later approach. If you really want to see how grueling ordering a car can be go play around in the Porsche online configurator. Not only can you nearly double the cars cost with options you can also loose several hours reading and weighing options on nearly everything!
The Tesla site took me about five min. to rack up a $170,000 price tag. I chickened out at the order now button.