Technical
Death Metal is really lame to me, especially the modern type. Way too much gimmicky fluff and superflous shred, not enough actual content to the song (IE riffs and the overall structure of the song).
Anata are the only modern tech-death band that really impresses me.
That said,
Atheist and
Immolation are among my
Absolute all time favourites.
Suffocation (I count them as both tech and
Brutal Death Metal), early
Atrocity,
Gorguts, Miasma, and
Demilich are all amazing bands... I generally have a thing for
Unorthodox DM bands.