SeeSax
Headphoneus Supremus
The different prices are for an ever increasing number of switches that allow you to tailor the sound as you see fit.
Lowest price has no switches, next one up has one switch, next one two, most expensive version has three switches.
Each switch allows you to engage a boost in one frequency group (Hi, Mid, Low) and you, as the customer, choose which band(s) you want control of.
So if you only see yourself wanting to apply a mid-boost on occasion, then you could go for the second cheapest model and request that the switch is for mid-range.
I really appreciate your reply that clarifies the price discrepancy.
Let me be the first to say, as a long time LZ fan mind you, that this in my opinion is a huge misstep.
-Collin-