Just because there is screaming, doesn't mean it is bad. Some screamo gets you pumped up, and me, as a guitarist, like to listen to great riffs played by the guitarists.
Best screamo band? I would have to say... none. No offense to what other people enjoy, but I do not consider it music; it may 'ump' you up, or encourage you, but anyone can just mindlessly scream out words like they do. Hey guess what, I think I am the next best screamo dude.
I will have to disagree Demon Hunter isn't scream anymore man like their new music is way too much singing! If you want a really good scream band that isn't death metal go look up I See Stars Those guys rock it!