My buddy and I have been recording dirt guitars for the last 2 weeks for the album we're recording and producing.
Getting tones, wow, where can one start?
Dig up the heavy guitar thread Slipperman wrote, that will give you an idea.
Basiccaly, there are dozens of variables and each variable influences any other

. Make any sense yet

?
Make sure there is someone present who knows the shit about amps and speakers and guitars and which who can translate what sound on cd sounds like what in the recording room.
My experience is that particularly the gain of the amp and the volume of the speaker play a big part...
If you have your killer tone sounding in the room, start with one SM57 and something like a Chandler TG2 pre. It'll probaly take a few albums before you really start getting the tone you want
Good luck,
Dirk