Sounds like you revised your post too much and now there's not enough info! What don't you like about the stock pickups/what are you looking to achieve by changing them? What's the guitar like acoustically - bright/dark/muddy/thin/warm etc?
The amp/cab is 80% of the battle when it comes to metal tones, but let's assume it's something that's getting you most of the way there.
Based on what you've said, particularly name-dropping Periphery, I'd say the Ragnarok will of course definitely do that in pretty much anything you put it in, and will happily do Trivium and Pantera too (although obviously don't expect to sound like Dimebag, his guitar tone was... unique! Works in Pantera but not elsewhere, IMO)