Okay...my comments are geared at the fact that you are shooting for a "top quality" guitar sound, on par with the albums you mentioned.
First of all, an AVT Marshall may not be total crap, but it's not going to deliver a tone like those albums, point blank. You may get close enough to satisfy yourself, but unless you specify what compromises you're willing to live with what else can be said?
Taking that into consideration, here are some things that you could consider vital to an awesome recorded guitar sound in varying degrees.
1 - An excellent sounding guitar that is well intonated.
2 - An excellent player with solid timing and proper technique. This can't be stressed enough. The way someone plays has a huge impact on the quality of the recording...even if it's just the way they strum a chord. A shitty player negates everything else on this list.
3 - A KILLER amp....we've already discussed this. Yes, it
really is that important.
4 - Someone who knows what the hell they're doing when they dial in the tone on the amp. This takes experience and experimentation.
5 - An SM57 will do the trick, but many also opt for a high quality LDC or a nice ribbon mic like a Royer 121. DOn't rule out other dynamics like a 421.
6 - Someone with the know how and the ear to put the mic(s) in the right spot.
7 - A nice quality mic pre. Not some 100 dollar "Toob" piece of crap, something respectable. If you really want world class you might as well consider something among the ranks of NEVE, API, Great River, etc.....
8 - High Quality analog to digital convertors (unless you're recording to tape..which I doubt). No, a 150 dollar USB interface does not have high quality convertors. The RME units have a pretty good rep, or a "money" stand alone converter like Lynx, Apogee, etc...
9 - The ability to not destroy it in the mix.
All of these things are VITAL. Sure you can get a great result with less, but not world class.
