Believe it or not, most audiophiles probably don't have the luxury of having an ideal, dedicated, listing room in their homes. We don't have a choice but to simply make do with the available space that we have within our homes, do our level best to incorporate our audio systems within that space, and hope for the best. You are very fortunate to have such a large space to work with. If I were you, I'd max out, or try to go beyond your budget as much as possible and shoot for medium to large, full range, floor standing speakers. There's about a million great speakers out there on the market that would fit your needs just beautifully, new and used. Take your pick. Happy listening.