The Holy Vehm ... release a full-length, dammit.
As The Sun Sets
The Sawtooth Grin
Dillinger Escape Plan
Head Wound City
Hella ... for slightly different reasons
Fantômas ... especially Page 6
Slayer ... God listens to Slayer.
Category 1.5: I respect as much as category 1, but listen to less often.
Hayaino Daisuki ... but for all intents and purposes category 1
Wolves in the Throne Room
Krallice ... taking months to digest
Electro Quarterstaff ... taking weeks to digest
Category 2: I love marginally less than category 1, usually because of slightly less impressive drumming or worse production. But don't get me wrong; I'm still obsessed.