can't go wrong with a seagull. i have a seagull 6 string that i love. for 12 string though i bought the martin one that is not real wood except for the top. i'm probably in the minority but i LOVE that guitar. sounds great to me and because the neck is not wood it rarely goes out of tune, which i believe is a common issue for 12 strings. got it for $550.
the takamine 12 string that looks like the gibson jumbo style is a killer 12 string.
http://www.worldmusicsupply.com/guitars/12-string-guitars/Takamine/EG523SCB-12.asp
anyone know any good electric 12 strings? not double necks, preferably not a rickenbaker or a fender XII