if youre into metal i would recommend that you check out Opeth. Theyre Dark, kinda growly at times but they have nice LONG songs that you can chill to if youre into that kind of thing. As for APC i loved their first album but i dont like their new one at all, you might want to check out tools, lateralus album, thats another nice mellow one. Hmmmm what else, im looking at my playlist as i type this....ummm otep is pretty cool too...but theyre nice and angry, usually when i listen to them i want to kill some kittens or something....j/k . Check out some Dream Theater too, i would recommend the albums Images and words, scenes from a memory, and stream of consc, i really didnt care for their six degrees inner turb much.
good luck