Do you think I should tell a potential employee of mine that I have asperger's syndrome?

No. It's not their business. Keep your personal life personal!
Not in these words. If you're an employer, you must be doing well in the realm of social skills -- learning them was tough but it sounds like you made it. You've learned to say nice things & talk about the other person's interests. Perhaps, "i can be a little bit of a character, but i'll do my best to do right by you, and really care about you. We'll be patient and helpful to each other.".