Oh sadly i am on a very tight budget, i was more thinking of some cool cheapish "pimping". Although i like the sound of a unit that can not only control lights but everything else.
Also when you say buzz, how bad are we talking, as i dont remember hearing buzzing when i went through the houses that had them (small sounds like buzzing and rattling really annoy me!)
I can only speak for mine you need to have your ear within 6 inches to hear it but they seem to vary a bit my mate had some cheap ones and they were "annoying" mine cost £70 quid fo 1 3 way light switch (3 buttons 3 seperate light rings and thats just the MM Room ) and if you think you could buy a standard dimmer for about £10 it can get expensive real quick!
But they are great along with a learning remote
OK SpatksCW is correct CAT6 is best but I used CAT5 (cause I had all the bits on stock) - I have the balums as well but used HDMI cables and they are a real pain to flush mount as the wire is so thick!
But as Sparks said if you have the floor up or are redecorating put the wires in it will be worth it!