Welcome Randy. As stone said above, you shouldn't plant anything you're not absolutely sure of. Even then, I wouldn't spend a lot on anything until you're sure they'll grow. i.e. they survive a whole summer season, and through the winter (when roots will still be growing) Start small and experiment.
You say you are "in the process of doing 2 really large Cleveland select pears". Does that mean you're intending to buy two large trees to start with? I wouldn't spend a lot on large trees, to be honest, if there's a chance they won't survive the juglone soil problem. Certainly don't buy two! I'd start with one small (less expensive!) tree, give it a year or one growing season, then make a decision. Definitely don't buy something that has any potential to be invasive - you think your neighbor is crazy now? Try having a hundred baby trees popping up in her yard to make her worse.
You might be wiser to spend money on a guy with a stump grinder, and a backhoe, removing the walnut stump, roots and at least some contaminated soil from that area and heavily amending with fresh soil and compost so you can be more confident of growing whatever you plant there. Don't forget that under the soil are many huge roots spreading at least as wide as the walnut tree's branches were, and all the soil around those roots is going to be contaminated to some extent.
Our neighbors in Utah removed a huge black walnut tree from their yard, and even years later they were still having to replace sod just to keep grass growing over the tree's remaining root system.
