PMJ is great. When Hailey Reinhart is in rotation.... wow. Her voice is amazing.She tours quite a bit on her own.
A couple of my favorites are Lzzy Hale from Halestorm, and Elize Ryd from Amaranthe. Amaranthe is more metal than rock, though.
The KISS one's not bad but this is what's captured my imagination, as of late: