I've been looking at roof racks in depth just this week...surfing the many galleries here...takes some time to do the searching, but there's tons of pics! Most are either the Thule Xpedition 696 (large) or 695 (small), or the Yakima Load Warrier

Check out the galleries of these VXrs...this should keep you busy a while:
JAFO
MSHARDEMAN
SPAZZ
taylorRitchie
LDub
KiethVXlvr
nocturnalVX
kpaske
TEN36VX