My stepdad loves Nightwish, theyre decent imo but not my favorite. If were bringing dragon metal into the mix, if thats even real lol, then i assume Dragonforce would fall under that lol!
Human Abstract and From the Embrace are both good! Thats pretty cool that you know them.
Another band i really like that i havent seen mentioned so far is Lamb of God. Theyre the first band that kinda got me into the "cookie monster vocals" as jinx put it.