I really like the look of this one... for the price it seems like they include a bunch more (more space for sure) than some other comparable cabinets.
Do you have the 8" wheels? As far as add ons anything you see is a must? I would think at least an extra rack placement at the top and grate.
I had the 8" wheels on the stick burner i bought from them. Work great if you are rolling across concrete. For my cabinet, I bought all terrain no flat tires. Rolls better over hard ground, but will still sink into soft soil and you'll need to use boards to roll across:
http://www.marathonind.com/10-Swivel-Caster-with-Flat-Free-Tire-P166C23.aspx
http://www.marathonind.com/10-Rigid-Caster-with-Flat-Free-Tire-P167C23.aspx
I added the folding table to mine, but that was before they came out with the cart version of it. If I had the choice now, I'd get the cart for the table top and the storage underneath.
I paid for two ball valves, but rarely open the second one.
Of course, you'll need to order a bottle opener and have it sent to Chris so he can install it for you.
https://www.capcatchers.com/collections/bottle-openers
As for grates, I had an extra slide put in near the top. I only use it when I want to take one grate out of the way.
Here is everything I ordered from Chris:
Insulated Vertical Smoker
Stainless steel side folding table 24"x 20"
Stainless steel handle
Tie down rings
Insulated smoker T-plates
Heat diverter plate
Brass Ball valve 2"
I believe the diverter plate comes standard now. I bought the T-Plates for the firebox (they are supposed to help guide the fire through the firebox), I seasoned them up, put them in a trash bag, and stored them in the garage. I have never used them. A couple months back, I had a buddy weld up a form that works great for me. Image below.