What if I were to be bold and completely re-arrange the living room?
The greyish rectangle in the upper left would be the new dartboard location with the throw line to the right of it.
Speakers should be obvious, the small wooden rectangle to the right of the love seat would be my media rack for now.
Unsure about the guitar location, just throwing out ideas for ideal home theater. I believe this setup would allow for 20" of distance between the TV and the Front speakers each direction.