If you find a shop that specializes in Japanese knives (of the kind we normally talk about here) i will go into the washroom and slam my head against the bowl for at least 20 minutes.
During the 3 years i lived in Phila i didn't find anything more fun than the normal Williams-Sonoma, Kitchen Kapers and such, meaning Shun, Global etc. Fantes in the Italian market has lotsa other fun stuff though.
Your closest bet is Korin and the others up in NYC.