Stan, I presently have 2 PWDs. My husband likes that size but I want a smaller dog now that I am getting older. So a medium sized poodle of around 25 lbs would be perfect, but I have come to the conclusion that a miniature sized poodle that is around 15" high, which is the maximum height for a mini, would still be a good size. It would be around 18 lbs instead of 25 lbs, but still big enough to be a sturdy dog. Poodles have longer legs than PWDs (in comparison to their body) so they are taller than you would expect.
Health and temperament are really the most important features, at least to my mind. So if you find a miniature breeder you like, ask for the temperament you want and if there is a choice, ask for the bigger of the dogs. If you concentrate too much on size, you might get a dog that is not suitable as a therapy or service dog.
So when I go looking for a poodle next year, it might be oversized if I get one from Caralot, or it might be within the AKC guidelines of 10-15" (12-18 lbs), although I would probably turn down a good temperament dog if it was the runt of the litter.
If the larger size is more important to you than me, you might want to look for standard breeders that do health testing and ask them if they breed towards the larger sized dogs or small standards. I would not go this route because I don't want a dog more than around 25 lbs, and a small standard can be 35-45 lbs, which is the size of a small female PWD. Neeka is 39 lbs and a very good size. I just want a smaller dog next time.
So I would advise contacting both miniature and standard breeders and ask about their size ranges and if they do any temperament testing (in addition to genetic testing). PCA breeders would be a good place to start, but the Internet is also a good source of initial information, which you can use to contact the breeders for more specific information.
When you find your poodle, please be sure to let us know and to post pictures.