Help with choosing a multiroom system

I am in the process of choosing a multiroom system for a house that is being completely rewired.

My budget is around £20k and the important items i want to install at the moment is a multiroom system with all cabling, speakers, wall units and controller. I am also interested in a home cinema projector and screen for my current speaker system but am not sure should be included in the zones or be standalone. I

I am looking for the system to have 5 or 6 zones and the same no of subzones and for it to be fairly future proof with the ability to add further zones and components later. I want the system to also be able to control video.

The systems i am considering are Opus 500 and Living Control. I like how the Opus system has a local input and can be expanded for use with lighting and home automoation and has an input for CCTV. I am concerned however that it does not use CAT5e and that it may be difficult to search for CDs etc on the wall unit. Living Control is more expensive but seems to have a very easy Ipod style system for searching for songs. I am not sure the compatability of adding non Living Control components to the system.

The number of choices are bewildering but I would be interested if anyone had any recommendations on the two systems or could recommend other systems. At the moment I am hoping my electrician will be able to install the system but may need a professional installer.

Thanks in advance for any help

Futureproof