I would have thought one of the other two reception rooms made sense - i.e. one for hifi, one for tv, then the big, bright, open room for cooking/dining/friends round etc - maybe with a squeezebox type thing and small-ish tv.
Seems a shame to fill up that room with all the hifi/tv boxes. Given women often seem to have more taste on these things than men, I suspect your missus will point this out.
What would the other two receptions be used for if you went ahead with your plan.