I am still shopping for a grill and came across this info on the 2004
Weber Genesis line. Weber also appears to be offering a premium model
with some feature of the gold series. Here is some data I extracted
from a merchants site:

New features for 2004 model year:

Larger lid profile
Redesigned handle
Thermoset Swing-Up shelves
Fixed lid thermometer
Condiment holder
Larger caster wheels
Redesigned Weber wheels
Rounded work surfaces with rounded trim pieces
Newly designed control knobs

Premium upgraded models include:

Stainless Steel cooking grates and Flavorizer bars instead of
porcelain-enameled steel
Solid lower shelf instead of wire
Extra right hand swing-up table