Might as well throw in a British and European band while I'm at it, who both veer towards the harder side of "sissy".
First up, Hell Is For Heroes. Again, pretty much anything off their album "The Neon Handshake", if you can find it. Tracks...
Night Vision
I Can Climb Mountains
You Drove Me To It
Disconnector
Retreat
Next up, there's Mínus (probably better to search for "Minus" though), who hail from Iceland. Their album "Halldor Laxness" is pretty good for a band who played heavy as hell hardcore before they had a stylistic change. Tracks...
Boys of Winter
Who's Hobo
Angel In Disguise
The Long Face
The Ravers
Insomniac