Grafted Pear Varieties

I'll be planting a few dozen pear seedlings this coming spring. Some I'm growing from seed of a wild pear, others will come form Oikos. Being seedlings I realize that drop date, fruit size, etc is sort of a crap shoot. I'd like to also add some proven producer grafted varieties. The most important characteristic I'm looking for is late drop date, as I typically do not start hunting until late October. All varieties I've looked at range in ripening date from August-early October. What varieties have been working for you guys and hold their fruit well into season? I know kieffer is a popular one and a later dropper, but some sources list it as dropping as early as Oct 10.

Grafted Pear Varieties