I would have to agree on the yoshikane skd steel. It was MY first eye opener knife and after 7 or 8 years and some light thinning it's still bangin out prep.
I would say that takeda has to be a classic. I have one of those also and it's amazing what he can do with AS. And his gyuto profiles are so different I think you should try it just for originality.
I think in the future the DT ITK could be a classic. (It's current age since original production isn't old enough to be a classic) but I think what the ITK could represent in the future and what Devin did with making really high end "mid tech" knives could make that knife a classic in short time. So many other makers have tried to follow that rout since his success.