http://www.qed.co.uk/acc/roomlink.html
Cheap but good control for IR to multiple rooms can use cat5 and is based on S4.4 MR system! some cheap learning remotes and a an Audio matrix switch is all you really need (sources and amps as well though!) Wiring is is simple enough, get lots of cat5 in and speaker cable, how many rooms and be sensible as cost is £4-600ish per room. This is my rule of thumb for hardware as a minimum!!!!!
Normal house we go for Masterbed + ensuite (subzone), Kitchen. Dining, Livingroom (normally has Hifi etc in it), outdoors, + what you want other beds, family bathroom and extras, games room, garage, where ever you spend time.Also try and spec TV in ensuite shower room and TV in bedroom on central system!