The Artifex 270mm is very nice for the money! AEB-L steel, but you may want to thin the edge out a bit for less resistance through the fish. I just got a White #2 Kono 300mm suji and it's sweet, crazy thin, light and great F&F! Fujiwara Suji's (carbon and stainless) would work if you are on a budget.
Sakai Takayuki Damascus with AEB-L:
It's only a 240 and not a 270 though:http://www.chefknivestogo.com/satadasu240.html
I'm guessing you are looking for stainless?