I've got a Mamola Replica which I love, and the Phil Reed is just about as nice, but my favorite of all time was Nigel's.
I love my Shoei X11 Kagayama in silver w white stripes. I really dig the newer Schwantz replica, the black/yellow Edwards replica from Laguna a few years ago. The Phil Reed replica was one i always said i'd buy if i had a british bike. Can't go wrong with the Hayes Jolly Roger, any of the TT edition ones, The Lorenzo astronaut, or that Checa globe either! Too hard to pick just one. My Kagayama rep: My Hayden rep: Perhaps my next lid: http://stores.sportbiketrackgear.com/Detail.bok?no=9956
I'm a simple dude. I liked Cory Wests WERA helmet from a couple years ago. I think it was just a simple black helmet with his number 13 on it 6" tall.
I love my SHOEI helmets for sure. Favorite graphic is the "Diabolic Revelation" with the cool holographic inlaid artwork. A few of my Scorpions have some nice graphics.