Why not TWTM? It has lists broken down by stage, and year, assuming you're beginning grammar y1 with a 1st or 2nd grader. For instance, my 5th grader read the list under logic stage Ancients this year.
Next year, she'll from the y2 list, and so on.
Paula's Archives provides a list of SL books in TWTM stages, and also has a list of other historical fiction & non-fiction broken down by easy-to-young adult: http://www.redshift.com/~bonajo/index.htm .
Classical CHrstian Homeschool also provides a listing: http://www.classical-homeschooling.org/grammar/index.html
Do you have a Veritas Press Catalog? If not, you can see how they organize their historical fiction titles: http://veritaspress.com/ .
HTH