I really like all the guys you mentioned too. I think my top 5 is as such because those guys really went where few else dared to go. They could all solo for 15 minutes and stay concentrated throughout. Their improvs rarely degenerated into mere noodling (a la Jerry Garcia or Trey Anastassio). I really miss Stevie Ray--had the pleasure to see him perform several times, twice in real intimate settings at the beginning of his career. Townsend is pretty awesome for what he did. He basically became the rhythm section while Moon and Entwistle went off and did their thing. Hmmmmm? makes me want to reach for the headphones and cue up Live at Leeds!