power amp questions for the B&W 805d

I see on the official B&W website they recommend an amplifier power of 50-120 watts for the B&W 805 Diamond. I see a lot of people seem to like Rotel and Classe... but I'm leaning towards either a Luxman 505u integrated -or- McIntosh / Marantz separates.

1) Would a 200, 250 or 350 watt amp be TOO MUCH power for these speakers, and could that much power hurt the 805D?

2) What type of speaker cables sound best with the 805D, copper or silver?

3) If you are using the 805Ds right now... which amplifer and speaker cables are you using?

4) Do you use a power conditioner in front of your amplifier? If so which one?