The Dimebucker is a high-output ceramic-magnet pickup. It'll sound like sh!t in the neck position, it's too powerful - it's just not what it was designed for.
When you get the Razorback, why not live with the stock pickups for a while and see what you like/don't like about them? No offence BloodMountain, but there's no point deciding on the pickups before you know what the guitar sounds like.