I must be getting old because I've seen pretty much every band I care to see at this point: Radiohead, Orbital, Faith No More, Mr. Bungle, Deftones, Incubus (dredlock years), Lords of Acid, GWAR countless times (RIP Brockie), Guns n' Roses (Use Your Illusion Tour), Chili Peppers (Blood Sugar tour), Prodigy, Rammstein, Beastie Boys (RIP MCA), Metallica (pre-haircutting/sobering up), Outkast, Rob Zombie, The Roots, System of a Down, Dave Matthews, Tool, Frank Sinatra, Beta Band, the Stones, Jack White before he crawled up his own ass.
Plenty of bands I'd love to see again (Faith No More, System of a Down, Prodigy) and I did miss out on seeing Alice in Chains which bums me out but there was a period of my life where I went to live music and comedy nearly once a week. Saw a LOT of shitty local bands, went to a lot of concerts that I didn't think I'd like where the band won me over (Dave Matthews, Orbital, DevilDriver) and a lot of other bands that, well let's say I would've been better off listening to my CDs in the car.
Either way, I consider myself fortunate to have gotten out with my hearing intact. Good times.
Never saw Pearl Jam. Not a big fan but they're supposedly a great live band. I guess that's my answer. Them and Sabbath.