I don't think you would need a sub but I don't like my bass over done. The 805s is pretty balanced but does not go as deep as the 803s. You will just have to use your own ears.
I find B&Ws image best when they are far apart with a lot of toe in ( almost straight at the listener). With the smaller 805s you will be able to place them closer to the wall (8ft apart and two feet from the side walls) with out issues. I would think two feed would not be quite enough room for the 803s to sound their best? Some one who has owned them could tell you better.
PS. Call up B&W as see what they say. I have found they are pretty helpful with questions about room size and what not.
I find B&Ws image best when they are far apart with a lot of toe in ( almost straight at the listener). With the smaller 805s you will be able to place them closer to the wall (8ft apart and two feet from the side walls) with out issues. I would think two feed would not be quite enough room for the 803s to sound their best? Some one who has owned them could tell you better.
PS. Call up B&W as see what they say. I have found they are pretty helpful with questions about room size and what not.