Hi Mike. Thank you very much for the detailed reply. That is very helpful indeed.
Maybe it is worth for me to provide some more information regarding my preferences, etc. I bought the chef's knife and the santoku at the same time thinking that I would use more the chef's knife. However as time has gone by I have discovered that my most preferred knife is the santoku and one of the reasons for this is the width of the blade. Maybe my cutting style has something to do with this; I use a chopping style (up down) rather than the sliding style (where the knife's tip doesn't leave the board).
Also, the reason that I mentioned non US based website shops is because living in the UK means that anything over the value of US$23 bought from US gets hammered by hefty taxes and custom's fees.
Based on everyone's advice I have done some research and so far have found out that the Tojiro Pro seems to be around the same price as the Hattori (unless I'm looking in the wrong places). And the CCK seems to be sold only by US sites.