For your situation I support the suggestion for the tube amp. I've tried all SS/tube pre/amp combinations, and my favorite was the SS pre/tube amp combo I had until a few years ago. I observed a bigger change in the sound (for the better) with the tube amp than anything else. I intend to move back to a tube amp soon for that reason. And your speaker's specs suggest that a reasonably priced tube amp should be able to drive them with authority. I think you'll be thrilled with the tube amp and Rotel preamp.
Michael
Michael