Hey Tom,

Here's a brainstorming list:

Locale:
-FSGenesis westcoast mesh
-MegaScenery v2

Textures:
-USA ROADS
-USA WATERS
-FSWater Flight1
-FSRoads, Rivers and Rails
-Birdseyeview summer(now free) /fall
-Realskyv2
-ZINERTEK - ULTIMATE NIGHT ENVIRONMENT PRO
-ZINERTEK - WORLD ENVIRONMENT PRO

Have you seen:
HORIZON - VFRUSA VOL.1 - SAN FRANCISCO & SACRAMENTO
http://secure.simmarket.com/product_info.php?products_id=1112

Research:
http://www.flyoakland.com/index2.cfm

Scenery Design:
-Terminals
-Cargo
-Misc Details
-AFCAD