My fave band/musician of all time is Accept/Wolf Hoffmann, so I try and get my guitar tone close as I can to his as well as trying to be a riffman like he (though extremely unsuccessful at his level.)
I listen to some oldschool metal, power-metal, prog-metal, thrash and some Southern Rock so I get a little bit of influence from each. Though I have a bit of a shredder and prog mentality, I love basic open chords (but with intricate picking) on acoustic and I try to include as much acoustic guitar in my work as I can without interfering with the aggressiveness of the music.
I am terrible as a riffer, so I write on acoustic using basic open chords and make the progression more intricate just by variating chords and adding stuff in between on electric after a basic rythm has been laid down. I have written probably 50 songs. Six are acoustic, but due to my style and writing technique, I play acoustic 90% of the time. Then again I grew bored with "shredding" (don't send me hate mail.. ha ha) and started focusing more on a "song" approach.
Bryant