The one I was thinking of getting is actually a V10 core with stainless damascus cladding. Which I guess is why I was worried it might be a bit redundant with the Shun.
Are you thinking of a Guytou or a Yanagi? All the Tanaka Yanagis appear to be Blue Steel and the Guytous are only 190mm long, that's just over 7 inches.
Tanaka use 3 steel, Blue #2, VG10, and Ginsanko.
his blue #2 is around 64ish HRC, and VG10/Ginsan are about 61-62. they are all great steel and great knives.