Ummmm... I've just realised something... by 'unpowered' you don't mean 'passive' - you mean a mixer without internal amplifiers, don't you?

The Yamaha MG8/2FX is similar to the Behringer, but with four mic inputs and a stereo input... and it is 'powered' in the sense that it cannot function without a mains supply, which previous posters have thought you meant.

So it's not really a lot different from the Behringers... other than price!!