I would vote XL and a sink. I use the sink all the time and the XL, along with the Ceramic grill Works 2-tier grill, allows for a ton of surface area. Charcoal isn't expensive, and the egg does shut off and sve leftover, so I dont mind using it for a smaller dinner.
We are a family of four, but love leftovers. Why do 1 chicken, when the grill holds 3 or 4 and the refrigerate so well?