I'm with mochamanz on this one. Even though I'm approaching it from a weekend warrior standpoint, I expect different clients to have different requirements. Some want long-lasting protection and high shine, some could care less about long-lasting and want a really deep wet glow. Some need heavy swirl removal and leveling, some need nothing but a light polish.
My "average joe" customers who just want their car to be clean usually get a AIO/SG(x1) or NXT(x1) LSP - it's easy and inexpensive. If they want a step up, they get Zaino(x3), maybe topped with p21s. If they want a natural carnuba glow or deep wet, they get just that - maybe p21s, 16, 26 or Souvern, depending on your clients durability and shine expectations and car color.
There are certainly some good middle of the road products for regular everyday work - dressing, wheel cleaning, metal polish, leather cleaner... These types of things are a little less important in terms of "boutique" items, I think. For example, Vinylex and 303 are pretty comparable. Armor All works great as a cheap wheel well dressing... P21S wheel cleaner is f*ing amazing, but might not be needed, so keep something cheap around...
Anyway, that's just my humble opinion. I'm no expert, but it works for me
