If you don't scan Reverbnation for new bands, you need to start. Through a search on their fine website, I found a handful of killer metal bands.
One such band is Nuclear from Chile. Harsh and brutally fast, these guys crush from note one. Here is a sampling from their new album titled JEHOVIRUS.
*EDIT: I had to remove the embedded song from Reverbnation because the code was seriously bogging down the blog. Reverbnation needs to fix that! However, here is a link to Nuclear's page where you can sample a few of their tunes.