I'm glad you're enjoying the Takedas. I like my little box cutter too.
The Takeda deba is two sided.
The Yamashins are on order and I should have them in the next few weeks but it's always hard to estimate. I ordered the several weeks ago but it's my first order with them so I'm not sure. They should be a step up in quality from the Tojiro ITK shirogami knives that we sell. You may want to look at those as well. They're inexpensive entry level white #2 knives at great prices: http://www.chefknivestogo.com/toitkshse.html