Hi Jedi. I am posting this link to you as i have personally played the E80 and i know that you are particularly looking for an arranger with builtin speakers. This has been discussed at length on the forum. You MUST play this instrument before you purchase it.

I am not trying to start any quarrels here but its importnat for the cost of the machine. Its a major investment and you need to get it right.
http://www.synthzone.com/ubbs/Forum37/HTML/014390.html

In one of the threads someone promised to post up instructions on how to get the speaker settings right so that the instrument sounded at least comparable to other speaker featured arrangers.I was then going to try those settings on the 2 or 3 E80's that i tried. As far as i can recall noone ever came back to me and i let it drop. Specs may fool you, new technology might bedazzle you but your ears never lie.