Ok, so I generally just use a single SM57 a bit towards the edge of the cone while recording, and generally I'm pretty happy with the results - my album was recorded with a single SM57 for all the electric parts.
Since I enjoy overcomplicating things though, what do you guys like as a second mic to support a SM57 on a cab? In particular I'm thinking the MD421 and the e609/906, but of course I'd be open to other suggestions (in the same price range, Crooks ). This would be used 99% of the time as a guitar cab mic, but some amount of versatility for other applications would be a plus.
MD421 all the way.