I think your right about the different types of sounds you can get from having different types of guitars play together. It just adds another demension to the sound (other than just playing other chord voicings) We try not to go all electric because we play more mellow sounding stuff but always have either all accoustic or electric and accoustic... I even tried my nylon stringed classical with an electric, that was kinda neat but I don't play that one too often because it's too hard to amplify it right and it gets kinda lost with the electric playing... Mostly we do this; I play an old Yamaha FG-140 sometimes ran through an effects box and the lead plays a semi-hollow body electric... I'd like to play more electric but I just haven't found the right guitar. I personally (perhaps from playing classical for so long) have a thing for the deep tones/sounds from old well played guitars.