Buy new from Newport dealer, or other?

[SoCal]

The Newport dealership near Fashion Island, Newport Beach is closest to my work. Any reason I shouldn't go there to buy a new Boxster?

I'll probably have to order one, since I want gray on gray (seal gray paint, with gray cabriolet top, gray leather seats and gray carpet). Almost all of their Boxsters have black tops and interiors, and there is not a single gray top on the lot or expected for delivery.

Any tips on buying? What to expect below sticker? Best way to negotiate? I tried to look at edmunds.com, but other than showing the base model invoice price, it didn't help much.

Since I probably will have to custom order what I want, I suppose there is no special window of opportunity based on when the 2006s come out, true?