I dunno about what model of guitar or any of that, but when I want to get the guitar to sound heavy without tuning down, I play power chords with the 5th on the bottom, like this;

E---------
B---------
G-4-------
D-4-------
A-2-------
E-2-------

This, along with the bass, really adds to overall heavyness. Ofcourse, you can't truely do a downtuned song justice just with this, so you'll probably still want that baritone guitar. As far as sound goes, I like Ibanez, but you should try out some guitars and decide for yourself.