A lot of technical or math metal bands have some fusion/jazz influences, which i think is cool. You should already know many of the bands I'm about to list:
Meshuggah is quite rhythmically "mathy." Their solos, as many have observed, are rather Holdsworth-ian.
If you like Spiral Architect, I'm sure you'll like Twisted into Form, which is basically Spiral Architect all over again. (It also has Extol's drummer)
Linear Sphere should appeal to fans of Cynic.
Behold....the Arctopus are touring with Dysrhythmia.
And duh, everybody should love WATCHTOWER!
And if you love Watchtower, you're probably already anticipating Ron Jarzombek's "Blotted Science", his instrumental tech project with Alex "Hammer Smashed Bass" Webster and Derek Roddy. Spin those Spastic Ink CDs a few more times while you're waiting
Cryptopsy - not bad, very technical, vocally they're crap though.
Dark Angel - Time Does not Heal.
Believer - Sanity Obscure is a tech-thrash classic.
Don't forget Planet X! Did somebody say Virgil?!?!
If you like neoclassical guitar playing, Winds should be right up your alley. Less choppy and more flowing than technical bands. Probably Hellhammer's most demanding band, although artistically I like Arcturus more (less technical band).
For more death metal fix, dig that Gorguts - Obscura! One of the WEIRDEST albums I've ever heard.
Atheist is a no-brainer if you like metal with brains. Especially the latter two albums.
If you REALLY like jazzy stuff, check out A Triggering Myth.
For lots of unusual textures and varied instrumentation, check out Canvas Solaris, an EXTREMELY promising band who I wouldn't be surprised to see on ProgPower one of these years.
Chris Poland's OHM should satisfy a hunger for fancy guitar playing.
For the prog-minded math-rockers out there, you already love mid-recent King Crimson. You may also have heard of My Complex, a Michigan math-rock band (not metal) who've been broken up for years. Minus the Bear is getting attention in this area lately.
And if influence outside the metal genre isn't your bag and you just want the straight up tech death, get a load of some Arsis and Theory in Practice.
I don't listen to tech all day, but there are times when you're less in the mood for dripping emotion and more in the mood for some instrumental pyrotechnics. Don't let the naysayers distract you: sure, endless wanking is boring, but when you gotta have it, you just gotta have it!
