Hard to argue against the T2's guitar voices, and the G70/E80's Guitar mode can get you close, but the bottom line is..... a great guitar voice and a great guitar style only get you close. I find they are best used for rhythm and strumming, and cover them up with your own keyboard playing!

Trying to make your arranger sound 'exactly' like a guitarist is a daunting task, and the voice itself is the smallest part of the equation. Just learning typical guitar voicing is very unintuitive unless you already play guitar. So much of what they do comes about strictly because that's how it falls under the fingers on a guitar neck. No other reason..... Because that's how the neck is laid out, that's how you do it, whether you like it or not.

Just find a good guitarist (they need gigs, too!) and be prepared for how much more you are going to enjoy your musical experience. When you only ever play with yourself, well, you know what your momma said would happen if you kept doing that!!