Hey Scott - congrats on your new ride! I also recently acquired a 2003 GS 430 and just got it tinted at Driven Dynamics in Rockville, Md. I live in Reston, so I know its a little bit of a drive, but they did a great job, are very professional, and have good deals going on right now. Plus they have an awesome waiting room with large screen plasma TV, xbox360, etc.
Good luck,
Sonny