I understand why you'd feel the need to word that delicately. And I'll admit, when someone tells me, "I want a LITTLE one..." I am automatically more wary of their intentions. I think that there is nothing wrong with wanting a smaller one, it's when you get the "I want a smaller one so I can put it in my purse and take it everywhere like the people on TV" motives that really send the red flags.
I think that if you told a breeder exactly what you told us here, that would be a very repected and understood request.