When installing conduits, provision for:
1. Thick coaxial cable for Cable
2. Similar cable for D2H (Tata Sky etc)
3. LAN Cable (You will need this for Media Player, networked Blu Ray play in future)
4. 8 Speaker cables (For 7.1 channel system)
Of course you will not use most of it to begin with, but this is far cheaper than having to accommodate additional cables once interior has been done.