Re: My friends power metal band Seraphiel is amazing! Check this out!
Very cool stuff...reminds me a little bit of Ayreon, might just be the keyboards doing that. The riffs are badass, production is awesome.
Also, regarding the growls: I say keep them in. There are not nearly enough super heavy power metal bands, and that extra bit of extremity, intensity, gruffness, or whatever you want to call that characteristic of not really belonging in "traditional power metal" is a great addition to the sound.
My old band did something similar, we had lots of power metal-inspired riffs and music, but the vocals was a lot of growling and screeching, supplemented with clean vox.
Another band around here plays straight up FAST power metal, but with growled vocals. Very similar to Quebec band Blackguard (although their influences also include folk metal)