Re: Duncan vs. Dimarzio Super Distortion.
Well, If you want to go Duncan, then consider that Paul Stanley uses the Duncan Distortion. It sounds better than the Distortion because it doesn't have some of the muddy lows the Super Distortion has with more clarity.
Ace Frehley as I'm sure you know used the Super Distortion for most of his career but he has switched to the Duncan JB. I met his tech during the KISS reunion tour and Ace had some feedback issues so his tech installed the JB and Ace said it was a 100% improvement from what he's had all those years.
So go for the DD or the JB. DD more agressive, JB not as bassy but sounds great for rhythm and even better for leads.