To get an idea of capacity, here are a few pics of my Large Spicewine with only two of the 4 racks loaded with butts. Based on your first post, I think a Med Spice would fit the bill for you. An important thing to remember is that these cookers will outlast all of us. You may pay a bit more up front, but you will never need another cooker.
Good luck again with whatever cooker you go with.
Lang 84 Deluxe Warmer with Chargrill
XL - BGE
Med. BGE ( Bought it for my son Vincenzo)
Kenmore Elite Gasser
Camp Chef Outdoor Stove
Blackstone Pizza Over