I'd skip the honey and save the cash for more hops, personally. The honey will ferment out and leave little (aside from dryness and booze) in it's wake. 12 pounds of honey is going to run, what, $40? That's a couple of pounds of hops in my book. I'd sub some table sugar for the dryness-factor you're looking for, if it were my batch of beer. I like the CTZ/cascade combo, but as noted above, CTZ has a powerful resinous flavor and aroma that can dominate the delicate flavors of cascade hops. Good luck with the huge brew!
Edit: I'll second the call for more dry hops as well. My IIPAs are dry hopped at a rate of one ounce per gallon -- huge hop flavor and aroma.