My 3 favourite guitarists are in no particular order:
Brian May of Queen
This man revolutionised what you can do with a guitar, a multi-track and a lot of patience, anyone who has heard his trumpet-guitar sounds can attest to this.
[yt]http://www.youtube.com/watch?v=wihX1KCS-d4[/yt]
Dean Deleo of Stone Temple Pilots
The most creative mainstream rock guitarist of the last 20 years in my opinon, an instantly recognisable style, melding jazz and metal into a very unique sound.
[yt]http://www.youtube.com/watch?v=FMSN39u7GkU[/yt]
Ry Cooder
This man has brought music from around the world to the masses, but is also one of the greatest slide players of all time, and can rock out pretty good when he wants to too. The video below is from the movie Crossroads. Ry is playing all the parts that Ralph Macchio appears to be playing up until the classical duel at the end. Steve Vai (the other parts) is not bad either!
[yt]http://www.youtube.com/watch?v=E3Gh4ARQqGY[/yt]
Honarary mentions go to:
Matthew Bellamy (Muse)
Django Reinhardt
Mike McCready (Pearl Jam)
Jim Martin (Faith No More)
Stone Gossard (Pearl Jam)
Pete Friesen (The Almighty/Alice Cooper)
Gary Lee Conner (Screaming Trees)
Pat Metheny
Dimebag Darrell (Pantera)
Joe Satriani
Link Wray
Guitars I have owned/own.
Squier Strat (Japan)
Standard Strat (USA 1975)
Ibanez RG750 (Japan)
Patrick Eggle LA Pro (1994, UK)
Peavey Predator (1992, USA, Restoration Project)
Amps I own/have owned:
Mesa Boogie MKIII (Head & 2x12 Cab)
Peavey Ultra 112 (All Tube 1x12 Combo)