it's true, but E60 is less than half the E80 price. i think it is the better deal. it is for me anyway.

no audio input. but neither a real use for it, since the onboard speakers are not meant at all for heavy load. they are good monitors, even in rather loud places, when the volume knob is turned to one to three o'clock degree.

OTOH, having a mixer is really a basic thing to me. there are alot of small mixers, i used to use a behringer (49$) which really help having the mp3 player (this could be a laptop or not) one/two mics and the keyboard plugged in. yes, you need 2-3 more cables, but that is perfectly fine cost for the benefit.

i couldn't do it without a mixer. i now use a 8 mics, 4 stereo ins, 4 outs and onboard efx mixer. amplified. i have it all in 5 kg weight box.