We are registering for a set of knives for our wedding. We have test-driven a whole bunch and have settled on Shun Premier. The chef's knife is really wonderful, I think, in style, comfort, and performance. We need two chopping knives in case there are a couple cooks working. Does anyone know whether a five-inch or a seven-inch santoku is preferable, or whether we should just get a second chef's knife? Thank you!