There are lots of good ideas above and I won't try to add to them. A good mix can be made with any of them, from the various artificial stereo techniques to Greg's suggestion of mono.
However, the one thing I'd add is that the first thing you have to do is decide on the importance and the place of the guitar in the rest of the mix.
Indeed, that's the thing with any mixing. You have infinite choices to make about what you want to be dominant and what is just "helping" the rest of the mix. Once you've made that decision, the choice of mixing technique will probably flow on from there.