Don't go crazy on eggcessories out of the gate. Figure the thing out then expand your arsenal. I like my plate setter. If it breaks, I'll probably fork over the money for an adjustable rig but to start, the plate setter does the job. My plate setter did break once but it was under the 3 year warranty so BGE replaced it. Couldn't justify buying the AR when BGE was going to replace the pate setter with no money out of pocket. If the new egg comes with the plate setter in a package, stick with that.
Can't even say. Never considered lump because I'd need propane or NG to cook on a gasser. If I tally up everything, probably around $3000 excluding lump and food. I need fuel to cool regardless of the vessel, and I need food to maintain my shape...round.