Are there collectable hammers?
As Mark has started I'll join in..
20 oz claw hammer with rubber and fibreglass handle, was cheap from the big orange shop but more comfortable to use than any estwing I've ever tried.
32 oz ball pein with metal box section handle welded on, every body laughs at it but again its really comfortable to use.
14 lb sledge, for when things really need a whack.