I use the Cardias prescribed nearfield listening setup (in a Cardias prescribed retangular room) and love it. The speakers/listening position end up being a 1.72 meter equalateral triangle. Imaging is amazingly precise, but yes it did take some getting used to (sitting so close). With nearfield setups, selecting speakers with a very coherent presentation (drivers close together, crossover frequencies as far away from 600 - 3,000 Hz as possible) is critical. My single driver speakers fits that perfectly.
Small/square rooms like that are very prone to one note bass boom. I'd look into room treatments (like GIK) or changing rooms. Secondly I'd avoid speakers capable of deep bass or use headphones for serious listening. As a last resort (only recommended as a final tweak, not a fix) look into room equalization. IMO most audiophiles spend way too much for amps/speakers based on the crummy rooms they use.