A locally suitable cultivar of Asian persimmon. Most independent garden centers here stock them.

What type of fruit do you like? As most fruits that require a second pollinator also come in forms with multiple grafts, you really are not very limited. With other apples in the vicinity, you are probably safe with a single selection and there are also self-fertile cherries and plums. But all come in multiple selection grafts as well, as do both Asian and European plums. And apricots and peaches are self fertile, as are figs and the persimmon mentioned above.

Most local garden centers carry fruit varieties best suited to our climate and all other things being equal, most will produce well. It's more a matter of picking the type of fruit you like best, ensuring you have sufficient pollination and going from there. Raintree Nursery can be a big help with info on climate-appropriate selections as well as directing you to self-fertile, multi-grafted or the best pollination choices.

Here is a link that might be useful: Raintree Nursery