For the price you'd be hard pressed to beat the Richmond Artifex Suji.
I have to agree that the Hiromoto 150 is an excellent knife with it's AS core and is also very hard to beat for the price.
Both great "bang for the buck" knives!
If you want to take a step up in class the Masakage Yuki Petty 150mm is a great knife: http://www.chefknivestogo.com/mayupe15.html
And don't overlook the Takamura Migaki R-2 Petty 150mm: http://www.chefknivestogo.com/takamura2.html