I have only pondered the question for a moment, and I am sure somethin' perty will tempt me, but I am thinking to concentrate more on soil and leaf spot prevention and less on more acquisitions. I would like to keep space ready for seedlings, have good ground and be disease free. If I add anything, it might be Siberians that repeat bloom.
For now, I am composting, mulching and using safe garden treatments - Actinovate and Serenade.