personally, i found DFH2 not as flexible as reviews say it is, especially for metal IMHO it doesn't give that "wow" touch, while its more suitable for pop, rock and such...
a month ago i got my hands on
DFH superior (9 dvds), and i must say that its WAY MORE complete and flexible than DFH2.
As for presets, sorry, i don't have any, i usually follow my ears.