I would second the idea of the Response 2.5. You get all that's excellent in the 2's with the benefit of a more extended low end, and you don't have to deal with the extra heavy stands that the 2's need to perform at their best. Other than that, I would also second what Jaybo said about the D2. It's the best speaker, "pound for pound", I've heard from ProAc in some time.
