great bookshelf speakers vs 12-18 k floor speakers

Just something i never considered, if you have a rather small room 13x20 with less tha perfect accoustics (Glass walls),high-rise. Anyway, i have always had tower speakers, currently Paradigm S8's v1. I have never explored smaller speakers, the so called bookshelf. Can i buy smaller speakers and still get the full range and soundstage that i get from the floor speakers? What would you consider as the best... especially when you don't have a large room. I don't always compare by price although you'd think a 15,000 set of speakers should be all around better a than a 5,000 set of bookshelfs? I have 180 Rouge Audio monoblocks, Rouge 90 pre amp, Ayon c-2 CD, Shenada Hydra 8 and much better than mid range cables.