So, here's my situation as a SCH progressing through the T6-9:

I have the Allagan book from T5 already. Everyone and their mother knows Crit is a SCH's best secondary stat, and the book gives a rather massive 39 crit.

I know I'm going to have to upgrade eventually, as the High Allagan book is a pipe dream at this point, but all the other books between the two Allagans just seem so...lackluster.

My question being: When should I upgrade, and to what? Should I focus on getting my Animus? Upgrade my Levi book? Get the Book of Diamonds?

I personally like the Animus more of the two i110 (stat wise) books, and as a SCH I'm pretty much bottom priority on receiving the Allagan Tomestone anyway. Is the Book of Diamonds worth it?