Hmmm... I find the 803s much better than the 683. But it is a big price jump! They image much better and have tighter bass. The highs also have wider dispersion.
But for your room the 803s would be way too much. I had a pair of 703s in a 12x11room (during a move transition) and I could not get the bass under control. Plugging the ports helped. But the real problem is if you move the speaker far enough out from the walls to get the bass under control the sound stage would compress and not sound right.
Anyway you should add the 805s to your list too. They are very good and would be a good fit for your room.
But for your room the 803s would be way too much. I had a pair of 703s in a 12x11room (during a move transition) and I could not get the bass under control. Plugging the ports helped. But the real problem is if you move the speaker far enough out from the walls to get the bass under control the sound stage would compress and not sound right.
Anyway you should add the 805s to your list too. They are very good and would be a good fit for your room.