Media for Voice activated home auto for handicap?

A local disabilities organization has asked me to look into what's available in voice activated home auto for a quad disabled person.

Can I get the groups experience on this added layer to a system?

I've located a few, but I prefer to investigate what's good for them and my company (ie low maintenance, good reputation)

They are looking at lights, heat, phone, entertainment (tv, cd, etc)

I had suggested a media center PC for the entertainment part to get everything under one control.

Thanks