As a guitarist - I think the PA80 is your best choice. It offers the dual inputs with separate effects for mic and guitar. It allows monitoring in small venues, and the connection to larger systems as well. The "friendliness" feature that some of us feel is a bit over the edge is not as important to you because you will have both hands preocupied with the guitar. Do all your work at home - tweak and fiddle till it sounds right, and then it's a snap to access midi files, backing sequences and even live drum patterns to strum alongh with. many times, I just turn on the drums and play the guitar as I would in a solo setting.

All the top end units have respectable sounds, but I feel the Korg has more to offer a gigging guitarist in a live setting.
Mostly because of the dual inputs and dual sequencers, and multi outs. No other brand has all three of these features, and sounds this good.