iroc

I'm in the process of making a 7 string with a mohogany body with a dimarzio evo 7 in the bridge and an airnorton 7 in the neck. I was wanting a pretty simple setup with just a 3 way toggle switch for my pickup selector switch wired up like an ibanez jpm guitar and just a volume pot. Not sure if I even want a tone yet. I was wondering if a 1 meg ohm would give me too much treble over the 500k. I play mostly metal and am wanting a really crunchy high gain sound out of the 7 stringer.