I don't know why anybody wouldn't want D9. Our saying in the Mitten is that it's the only place where you can get all four seasons in one day!
I'm enlisting out of Detroit and am looking at NSC's and WHEC on the Pacific Coast. Anything I get out there would be so awesome! To the OP, I would suggest looking at the different units on uscg.mil. Most, if not all have a unit information sheet that highlights a lot about the area the unit is in. That's where I've been doing most of my research.