I think Necrophagist is pretty good. But I don't find them to be terribly listenable for long sessions since things tend to blend into each other over time. I love tech metal of any kind though. I even enjoy Dillinger Escape Plan for the fact I respect the furiousness and technicality of their work. That is blasphemy to you "true" people I'm sure, but I don't care. I wouldn't mind knowing about some more tech bands really, so long as it's got at least some sense of rythme to accompany it.