Good metal core and hard rock bands?

i love music all kinds and recently started up a cd Collection. im looking too add some nice rock bands.. i dont like old school stuff that much i like recent bands such as as later 90s and going on through the 2000s or bands that formed in the 2000s... i like newer rock not old rock. if you you know any good bands let me know. the best from each genre like punk, hard rock, metal core i love metal core music...i like harder bands that have nice rhythm too em like killswitch engage,scare Symmetry, bullet for my Valentine, dragon force those are real metal core bands(bands with nice melody). like i sayed i like recent bands no earlier then the 90s such as system of down,HIm slipknot,Marilyn manson on and on...preferably bands with melodic hardish sounds...love metal core! thanks for you're answers