I'd agree with DanW. There can't be much that CAT6 or CAT7 will offer over CAT5e, or any specific Meridian cable. CAT5 STP is well under a pound a metre, the metal plugs can be a couple quid each but we're still talking not a lot. As an installer it means we can pre-wire several rooms for our customers without having to spend a lot on cable meaning you can move your theatre around different rooms in the house (or I can tempt you into buying a second system easily!).