I do like the B&W but I think go for the HDR version. It's got an intersting 'punch' to it.
I fiddled a little in PS and wanted to show you a suggestion. Now the only thing I'm not sure about is the window is directly in the center but I was thinking that the sky removed would look better and darkening the back wall leads you straight to the window.
Maybe someone else has a better suggestion but I kinda like it better without the sky. If the shot is already cropped and you have rom to recrop and not have the window directly in the center, that might work.
Btw, I didn;t desaturate the copy, the site seems to change my uploads a bit and does that.