I wish I'd seen this thread when it was first started.
Johnathan - it really depends on how close you absolutely want/need/have to get to, say, Pete Townshend's tone (I assume that's what you're going after - either him or Gilmour). And, of course, how much you're willing to spend.
I can tell you that my guitarist has the new Pete Townshend signature series Hiwatt. Using the right guitar at the right settings, yes - it absolutely sounds exactly like Pete's old tone (assuming you have a similar attack, etc.).
This might muck things up a bit but if you're a true PT aficionado and are in a situation like us (tribute band striving to get everything right), then yeah - the extra grand is worth it if you have it.
If not....your friends have given you some other options.
Watch e-bay for SOUND CITY gear too - the same makers as Hiwatt, just a different nameplate.
Cheers and good luck! Mike