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I always use spares, figure 1/2 rack ea, then another full rack fer just incase, my daughter in law will see to it there ain't no left overs! I use 3-2-1 myself.
If you have the option, call the place you're going to buy them before heading down there. Ask them if they'll cut you a deal for buying in bulk, that is, unless you are getting them from Sams or Costco.
A half slab is good, get some chicken leg and thighs for backup they are cheap and you might have leftovers. Actually a 1/4 slab and a chicken 1/4 is a great combo. I served that in my restaurant and it was a hit.
I had rather err in the way of too much than too little. Also I agree with the chicken as second meat. 10#'s of thighs do not cost much and smoke up great. Just my .02 for what it is worth. Good luck!
hmmm.if thats is all you are doing..enjoy the day and fill the cooking grates to capacity..send your friends home with a doggy bag..they will love ya for it.
But if they are great..might not be no doggy bag. give em roliads..lol.