definetly check out continiou renacer cuz that shit is awesome...most def listin to the dude who reccomended sleep terror. they both have a lot of jazz influience. canvas solaris is fucking amazing and pretty tech. if you get their demo album they have vocals on that one and its sweeet death metal but i must say they sound better as an instrumental unit. check out some of their older albums cuz their new one is more mellow. also check out
electro quarterstaff-lot of thrash influience
behold...the arctopus-jazzy tech metal
novum organum- broken up but myspace still works
thats all i can think of...but seriously the bands mentioned in this thread may not be as death metal as you want but they are seriously sick( aforementioned zebulon pike and blotted science)