Polk Audio Monitor 70 AM7025-B 3-Way Floorstanding Speaker has phenomenal sound. Crisp highs, crystal clear voices, and very high detail with an open sound. You can clearly make out any instrument while an entire orchestra is playing, and when you play vocals it sounds like you are having a private concert in the room with the person standing right next to you. Movies sound very realistic and it is definitely better than going to the cinema.
Many people use these with no subwoofer as they have a fair amount of bass to them. Best matched with a CS2 or CS20 center. The Monitor 70s and the center speakers are both large and heavy, so make sure you have room first though. Most people also go with Monitor 60s for surrounds if you have room for them.