Well, with that list... I REALLY hate to say it (just ask twohands
) but Line6 is your only bet. Those tones are just WAY too diverse to be nailed by a single amp. Not only are we talking huge;y different preamp sounds, but there's a substantial difference in tone and compression between a 6L6 and EL-34 power tube.
As for speaker emulation, it can be bypassed in the line6 stuff, if you're using it with a poweramp and a cabinet.
More imporantly, though, do you REALLY need to have all those tones? I mean, back when I was playing a mesa combo (rocket-44; think of a VERY pared down mark-IV), i once posted a cover of Satch's "Always With Me..." over at www.guitarwar.com
, with a RG-520 (mahogany body). Gearwise, that's about as far away from satch's setup as you can get, yet it was a LONG time before i got more compliments about my tone again than i did on that cover. It might not have "sounded" exactly like satch, but it "felt" right. Likewise, my current setup, a TSL-100 head, sounds totally authentic playing dream theater riffs. Sure, it's worlds away from a dual recto/mark-IIC+ doubletracked tone in actual "sound," but it still sounds "right." It's more what you play and how you play it than what you play it through. I'm not saying I can sound exactly like either of those players whenever I want to, far from it, it's just that a good high-gain tube head that has a good tone on it's own will get you close enough.
Play a bunch of amps until you find one YOU like, and let the rest of it sort itself out. You'll be happier in the long run doing that than spending hours tweaking preamp resets trying to nail fifteen different players' tones.