The top of the DJ on the spine is marred, thus not very fine. At best, given the pics provided, (without more pics, that can make sure there isn't some fade to the spine) the dj is AT best VG+ of NF-.
Can't comment on the book itself, but if her assessment of the books shape is the same as what she graded the dj, it's likely less than Very Fine.
Let's go with this. 1st 1st Gunslinger with VG+ DJ, and VG+ book: $450-$600.
NF DJ and NF book: $600-$700
Fine DJ and book: $700-$1k (the DJ then becomes as or more valuable than the book.).
Just one guys opinion.