If I were a stringer, I'd stock these for sure:
Liberty 16 – for the cheapskates
Dynamite 16 (really a 15L) – for durability with softness
Dynamite 17 – This is what I'd suggest to the majority of players
From there, I'd very likely have these:
Dynamite 17 or 18 Soft – This is what I'd suggest for people with tender elbows.
MonoGut 17 – for the poly people
NRG-2 16 – for players who like a fairly stiff and durable string
Gut would be a special order, or a "bring your own pack", and would be an extra charge.