Beer and a life time supply of heavy duty foil .
I like the full-sized Weber chimney...there are times you want a full chimney of hot coals for 300-325*F smoking of turkey, chicken, etc. And for 30 briquets for Minion, just flip the full-sized chimney upside down, place briquets in the small end, and light as usual.
Good point, Chris. Weber's full sized chimney is more versatile. If you're only going to have one, that's definitely the chimney to have.
Pretty much all you "need" (besides charcoal and some way to light it!) is a couple of thermometers. One leave in type thermo, preferably with an "ambient" probe and a "meat" probe, and one GOOD instant read thermometer. The first one is to monitor the fire and the meat as it is cooking, and the instant read keeps you from serving under cooked food as a back-up to the leave in type.
Some guys like the Maverick leave in thermometers, and other like the Igrill. both allow "remote" monitoring.
Everybody likes Thermoworks for instant read.