I'd say print out that map, and possibly pictures of the storefronts will help you out. All the cool TF stuff in Akihabara is in walking distance. And try the back alley shops not mentioned on the map, I found a bunch of cheap henkei not neccessarrily from toy shops, more like Red Dot Akihabara or Crazy Akiba's.

I may be back there in January myself.