Originally Posted by Madmardigan
Probably all three, although double-tracking your parts will make them sound a lot more spacious.
When you do get some time to experiment, I generally find myself placing the mic on axis, against the grill, and either right in line with the point where the dust cap meets the cone (a flashlight helps here) or within 1" of that point, outwards on the cone. And, if you haven't already done this, dialing in your amp either listening through the mic, or with your ear in line with the speaker, really helps too, especially
if you're using a combo with the speakers down at or below knee level and nowhere close to your ears (even a 4x12 sounds different but you're at least closer to being in line).