I have the 21Ls I find that they need a LOT of room to breathe. 40 inches plus off the backwall if possible, its not with my current living room layout (sigh) so they are only 32 inches off the back wall.
I couldn't afford a subwoofer and my system is a Music/Movie (60/40) mix and it seemed a prudent decision to go with the 21Ls instead of the 12Ls and I don't regret it.
Monitors will, generally, have a larger soundstage than floor standers. I don't find it to be lacking with my setup but everyone has different equipment /preferences.
I think that the 12Ls with a good filled stand (www.skylandstands.com) would be more stable than the 21Ls as they are not sand fillable.
I couldn't afford a subwoofer and my system is a Music/Movie (60/40) mix and it seemed a prudent decision to go with the 21Ls instead of the 12Ls and I don't regret it.
Monitors will, generally, have a larger soundstage than floor standers. I don't find it to be lacking with my setup but everyone has different equipment /preferences.
I think that the 12Ls with a good filled stand (www.skylandstands.com) would be more stable than the 21Ls as they are not sand fillable.