Before buying any big-deal knife, you really should consider how you plan to keep it sharp. All knives dull eventually -- rather quickly in a pro environment -- and you'll need to establish and maintain your own edge.
While the Misono is a wonderful knife it has some idiosyncracies and is not the best choice for everyone. It's a very narrow knife, somewhat whippy, and many people find it difficult to sharpen (but not me). It was an extremely popular choice a few years ago, but not so much anymore. It's also well out of your stated price range in your preferred sizes (presumably 23 and 27cm).
In your stated price range, you might want to consider Misono Moly (widely available), Tojiro DP (widely available), Kakayagi VG-10 (from japanesechefsknifes), and either of the less expensive Togiharus, Inox and Moly (Korin only). Kakayagi is JCK's proprietary name for a couple of OEM manufactured lines. Their VG-10 is a lot of knife for the money, and if you don't need a roomy handle (like the Misono has), is certainly the best alloy, has good fit and finish (as Japanese knives go), a decent but smallish handle, and is probably the best vallue.
There are a bunch of good online knife sellers, including but by no means limited to: Japanese Chef Knife; Epicurean Edge; Korin; Chef Knives To Go; A-Frames Tokyo; The Best Things; Japanese Wood Worker; etc.
We can explore other choices, but as I said I'm not happy hijacking this thread. If you have follow up questions, please ask them in the Knife section of the Equipment thread here on Chef Talk.
BDL
Edited by boar_d_laze - 6/4/10 at 11:05am