While I agree with Phil (who has great guitars) and Spaw above, I will say that I fine instrument can be very inspiring, and that's purely psychological but not a bad thing. Too, if you can forgive a slight drift of thread, the guitar can make a difference if it is what fits the music. By this I mean that not all guitars, cheap or expensive, may have the desired sound for a tune or song. I get a little weary of the same guitar sound all the time. Often a 12 string, electric, alternate tuning, high-strung or capoed, baritone, bass, or whatever guitar can break up the monotony of the same guitar sound or timbre, no matter how good, all the time. That said, there's still lots of ways to get a variety of sounds from one decent instrument, and I wish more folks would.

Gear acquisition syndrome (GAS) victim, Mooh.