+1 for the gold, I just put an ash catcher on my silver. Fortunately for me it came with the hinged grate.
Right answer to go straight to the gold. Cheaper than upgrading it later AND you get the thermometer in the lid.
One guy's view...
WSM 18.5, Broilmaster D3 natural gas (in-ground), Weber OTG (upgraded silver), Stoker ATM, Maverick ET-733 & 732 thermometers and Red Thermapen