I prefer mic'ing a cab as much as the next guy. But the thing is, I don't have the money to get all of these amps. ReValverMKIII, PODxt/X3, and the likes give you a useful tool. True, PODxt so far has a very digital sound to it, but that could work for some things, as shown by BlackNeonBob, Splat, Bulb, that guy with the song named Egg, etc. ReValverMKIII is the newest attempt by anyone and so far has the best results that I have heard from any ampsim. I don't plan on selling off my Bugera, MP-1, MP-2 and Dual Recto or my Mesa 4x12 at all...I just look at ReValver as another amp, more specifically another tool. Another option. If it yields great results, you bet your ass I will use it. If a band comes in and doesn't like any of the tones I've gotten from a mic'ed amp, ReValver just may save the day. My goal is to provide bands with the most options that I can. My approach to recording guitars is ALWAYS take a DI. Always. Even if I don't reamp, or do anything with the DI track, at least the options are still there. Having the DI opens up so many options. Having cabinet impulses opens up even more. If they don't like the tone they got, I can reamp the guitars into one of the amps I have, if they like the amp but not the cabinet, or they like the amp and cab, but not the mic, I can use an impulse. It's a pretty impressive ability to have, IMO.
All that said, I think I will only be getting the RaValver HP version and SIR2. The only amps that I care about having are the Peaveys and since the HP version doesn't allow you to import your own impulses, SIR2 will remedy that problem. Plus I'll pretty much be spending the same amount as if I were getting the full MKIII.
~006