csmager:
I think the point is that CAT5/6 might work over small distances for ML/PL, but over greater distances and for future HD video usage, CAT5/6 will likely prove inadequate.
If you had the opportunity to rewire your house, you'd be daft not to use CAT7 if you had any intention of sticking with B&O.
I'd like to caution against this type of thinking. Csmanger is correct to warn against any other structured cabling installation other than Cat7.
If you think in terms of "what can I get away with" as far as short distances and basic ML Bus activities you're going to put yourself in a position where the full distribution and matrixing of 1080p+ video will not work and you'll end up reinstalling some or all of your infrastructure. Besides, why would you buy a spool of Cat6 and a spool of Cat7 in the first place?
The whole point is "one cable does it all" which makes it easier, cheaper, and tidier.
There is scarcely anything in this world that some man cannot make a little worse and sell a little more cheaply. The person who buys on price alone is this man's lawful prey. - John Ruskin