One thing that Lexicon has going for it is (besides being very good as-is) that the initial purchase is like a buy-in to the company. They offer upgrades in both firmware and hardware over the lifespan of the product. After they have maximized the upgradability of the product they offer insane trade in options. At one point the trade in value of an ancient Lexicon (that would go for maybe $400 on Agon) was such that for something like $600 + trade in unit, you got their top of the line processor.
Good luck!
Good luck!