Logitech Z5500's and they go for well over $150, even on sale, because their the equivanet of a home theatre system (5.1 speakers + control unit and amp). You'd be hard pressed to find 5.1 speakers that accept optical in for under $150. All the cheap 5.1 speakers are analog and require 3 color-coded cables which you can use only if you buy a soundcard, which will cost you at least $100.