I think that the formula must include money for room treatment - besides speakers that is the #1 influence on sound quality. Fortunately room treatments are a big bang for buck category too, especially if you can DIY.
Speakers: 40%
Room Treatments: 10%
Pre/Amp: 35%
CD Source: 10%
Wires: 5%
Speakers: 40%
Room Treatments: 10%
Pre/Amp: 35%
CD Source: 10%
Wires: 5%