Sorry, I don't have Chinese software and I am by no means trying to show off English.
Do you still have all these bikes? If so, I don't see the point of keeping them all. Like one of the earlier replies, there are signigicant overlap among the six. If I were you, I'd have on in different material. For example, one each in Cro-mo, Aluminum, Carbon and Titanium. After all, last I checked, most of us have just one ass.