No one's said anything about one of the best (my favourite)...Ritchie Blackmore...while he's not THE best (that would be Hendrix), he's totally amazing and almost technically perfect. And, of course, he came up with the riff that every kid who picks up a guitar thinking of becoming a rock star first learns...duh duh duh, duh duh DUH duh, duh duh duh, duh duh... :wink:
Also, the triumvirate from the Yardbirds: Clapton, Beck and Page...two that haven't been mentioned: Pat Metheny and Al DiMeola...another fave of mine Rory Gallagher.