Pavor
Spawn of Possession
Necrophagist
The Faceless
Nile
Arsis
Gorguts
Theory in Practice
Cryptopsy
Everyone else posted a list, so I figured I would. I've really been digging the first albums by Pavor & Spawn of Possession a lot lately.
The bands I posted are more tech than prog death, but still killer. Don't know much about prog death unless you count older bands like Death & Atheist.
I used to really big into them. They're fucking awesome, good call. Probably not for everyone though. I've heard very bad things be said about them here, & that made me sad.