Because of Amazon digital sales my backlog is too depressing to count. The good news is I have only bought 2 books so far since the Christmas sales, GA Wonder Woman 2 and the last new Superman volume.
Every week I chip away another 1 or 3 depending on when it's from and how many pages. Not buying modern books helps a lot, as does having most of the stuff I want already.
I'm looking at mostly some Marvel Epics and the annual FF MMW.