if you're worried about interference (nav goes through the shark fin anyway), carbon tint is fine too (not metallic), and down near the $250 total range. When I asked for Huper Optik ceramic, it was $500 in NYC. Figures do not include windshield. I was convinced that unless I lived in a hot zone (ie. AZ), I wouldn't need the highly reflective properties of the ceramic anyway... now I see where you're from.

BTW, if you need more options, you can check your state here: http://www.tintdude.com/site-map-1.html

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr