Id also suggest if you are going to mic a guitar cab a good method i came across is to use 2 SM57s not betas just the regular type point one directly at the speaker and EQ it with NO bottom end then take another and angle it in from the side so you get this sort of positioning | \ then EQ the angled mic with no top end. Then mix the two together. This way you get a balanced sound which is big enough to be used in mono as a rhythm part rather than having to do endless takes of the rhythm track and then panning them all which ways. This all saves tracks which in home studio cases really helps.

Stu