Dude i use a KORG KARMA and TRITON.
I play in a metal band too, i love folk metal like Ensiferum and shit!
Part of being a metal synth player is creating your own patches, i thought oh yeah tuomas from nightwish sounds bad ass ima get a triton and karma! so i did and i was disapointed on few things tht it turns out he makes his own patches jus like EVERYONE.
So i sujest to you is get a synth like the triton (not LE) or the Karma you can spend not a while lot, i got my karma for 500 nd my triton for 900 used.
study its features and get the acordian and mod the **** out of it till it sounds awesome, also remember theres tons f people who upload PCG files to on the internet especialy for your synth.
So with a great synth like the triton or karma your truly set. Email me if you have more questions as being a metal player i can guide you alot.
(e-mail address removed)