I'm a big fan of Balvenie myself. Another method you could use to find the flavor you're looking for is just blend the whiskies. Do some small (or not so small) samples, blending them together in different proportions, and see if you find what you're looking for. Granted, flavors will be a little different when you actually use it with spirals in a beer. But it should give you an idea as to what kind of split you want to do.
You'll also get to do some whisk(e)y sampling.