Laynestaley, I'm not sure what
Full means to you, but Wide and Balanced is what I like. No doubt tracking the same part twice and panning can give great results, but it can very tedious and difficult to achieve a unified sound...
I particularly like a very wide Acoustic guitar image, but natural sounding. I've found this method to be the best in balancing the overall guitar and minimizing the problem areas. This method also collapses to mono very well.
Start here (assume right handed player):
One mic is in front (12 to 20 inches), slightly to the left of and pointing at the neck body point (approx. fret 15). Make sure it's not pointed at the sound hole.
The second mic (same distance away as the first mic) is positioned over the right shoulder, pointed at the bridge. Rotate the overhead mic forward or backwards to balance the image. Forward for more boom and back for less. Playing over carpet or a rug will minimize the overhead mic's early reflection. Try both.
This technique gives an excellent balanced and wide image of the guitar tone and minimizes pick noise and sound hole boom. You can achieve a great tone with this in a very short time and with a lot less hassle than with double tracking and can sound just as good.
If you're interested, here's a clip I just through together. The first part of the clip is the front mic in mono, and then the spaced mics.
Acoust Gtr Spaced Mic Demo
-Keith-