As has been said, broadening your horizons can only help.
The term 'good music' comes ridden with ridiculous amounts of bias; most will argue that heavy rock goth death hard-grind-death-teddy bear-rawr-elitistcore metal techno is the best genre EVAR and will bash you into bloody submission if you so much as hesitate to agree with them. (Music is incredibly serious business to some; that's all I'm going to say. You've been warned.)
Half-troll aside, I like A Day To Remember, Nightwish, and a few others who I can't remember at the moment.
Most metalheads also enjoy them some rave-ridden techno. Search anything by DDR; you should be able to pick something you like out of there. (For me, I find "Stamp On The Ground" by the Italobrothers to be just fantastic, but again, that could be just me.)
If you're a fan of Rise Against, you also might enjoy Avenged Sevenfold; though I don't, I hear a lot of good things from a lot of people about them and I can't seem to help drawing a comparison despite the difference between them.
I hope I helped. :)