i use the 80/20's..0.54-.012-martin makes the best sounding ones IMO
ive seen everything when it comes to 12 strings,ive seen people come in to record on them and just say...okay,its your money.
ive even seen people string'em up backwords..with the .054 up top rather then the .032/.054.
spend alot of time fiddling w/them getting them straight,its personal experience that a 12'er out of intonation can be a nightmare to keep/tune.
i strongly suggest straightning out the neck before anything,tighten the truss rod till you have only a slight dip.
this is the mistake i see most.
the truss rod not tight enough or over tightened.
w/out a dip youll get fret buzz,w/too much of a dip youll get out of tune chords in some spots.
its also about comprimise unless your playing the best 12 ever made.
find the box your playing in and tune it up,the general is from 1-3-5 frets.
i have a martin and i still have fluctuations in the 7-9 region of my frets where im off a small amount.
capo isnt the exeption exept finding that box i spoke of.