It depends on your taste in music and how loud you want to play; I would wait and try them and see for yourself.
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I suspect you may find the 805S to be borderline in a space that size. At least, I did in a space only marginally larger. It's the primary reason I sold my 805s -- which I loved -- and moved up a notch to the 804 Diamond - which works much better for me. But then again I didn't have a sub with the 805S.
The effects or contribution of a sub in a large space will be relatively small. Setup and sitting arrangement are crucial in this circumstance. Listening distance from speakers preferably not more than 8' or you would lose the scale, enveloping sound and bass slam from the 805S ie. the whack of drums and the surreal feel of live dynamic music. A larger full-range floorstander will perform better but the 805S can sound decent if listening in near to mid-field arrangement.