Kuni in Portland is one of the top centers according to BMW, and I've read some other local forums that say they have been good to deal with.

Also, the BMW dealer in Yakima (Hahn) is supposed to have really good prices. I have not bought nor dealt with either.

BMW Bellevue: Bought 335i there, and had service done. No bad experiences.
BMW Seattle: Had X5 hitch installed and service done there. No bad experiences.
BMW Fife: Bought the X5D there in August 2010. Got a good price, no bad experiences.

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Scott
On Order: 2015 F15 X5 35i
Space Gray with Mocha Nappa Interior Design Pkg and fineline Oak trim
ZXD | ZCW | ZPP | 3AG | 456 | 4UB | 4U1 | 5DL | 688
To be Traded: 2010 E70 X5 35d
Alpine White on Black with Dark Bamboo trim
ZAP | ZCW | ZPP | ZPS | ZRC | ZTP | 322 | 328 | 330 | 386 | 4AZ | 4UB | 655 | 6FL | 6NF