If you can find any of the customs that Rick mention in a folded steel 240 Gyuto for under $1000... you'd be getting a really nice knife. They usually float around right around that $1000 threshold, but since you are asking for a SS knife under $700, the point is moot.
Adam reiterated my Tanaka reco, I'm sure because of the SG2 core steel of which will offer you some fantastic edge retention, but you have since stated you are going Wa so this reco is now moot.
BDL recommends the Yoshikanes of which you have since stated a SS preference leaving the V2's moot. Their SLD offers an awesome semi-stainless core that one of many residents here, MadRookie,
owns & LOVES.
There is a Wa-handled PM steel blade that will offer outstanding edge retention at that site, as well. I do have experience with the maker, Asai, and have been very pleased with their product although to be transparent, I have no experience with their SG2. http://epicureanedge.com/shopexd.asp?id=87260