im assured you are already bored with At the Gates, Arch Enemy, Opeth and their equals, but in addition to the already mentioned ones, check out anata, quo vadis, neuraxis, dissection (Storm of the Lights Bane), try to get a hold of chastisements two albums and the crown's (not fully "melo" but) albums: possessed 13, crowned in terror and deathrace king. Engel's debut album absolute design has just come out. check out
ENGEL - Absolute Design , you might like it. arcturus is abit avant garde/bm but they usually go well amongst melodeath fans. Should you for some reason not have heard Cynic (really tech/prog-death by genre), go get their album.