The first bands that came to my mind was BTA and Extol, but they've already been recommended. Here's some of my recommendations.
The Showdown's A Chorus Of Obliteration. It's the only "technical" The Showdown album, and their only good album all together IMO, but it's some of the best Christian death metal that I've listened to. I wouldn't call it quite as technical as BTA, but I would call it fairly technical. I highly recommend it, just don't try to kind technical stuff in any of their other albums, or else you'll be disappointed.
YouTube - The Showdown - From The Mouth Of Gath Comes Terror
Also check out their song "Hell Can't Stop Us Now".
Immortal Soul's Wintereicht also sound like a good fit. But I can't find much on Youtube, so no links.
That's all I can think of, I really don't listen to much technical stuff, though I never really thought about it that way before.