Any good screamo/post bands?

Well Test Icicles is pretty good. And I like your taste of music w/ Fugazi, Sonic Youth, and Big Black. :D Maybe instead of Screamo you should also try some Death From Above 1979. Hmm what else.. You can also just try out The Blood Brothers, Yeah Yeah Yeahs, The Horrors, Cap'n Jazz, and My Bloody Valentine. Sure some of them aren't exactly what you're looking for but just try it :)