#4 Power- I use the Furman Pluglock; fits all the walwart no prov. i got it for 30-40 bucks on ebay (can't remember exactly but cheap!) 

it left me with one plug for the OneSpot to power the rest of my pedals but it was noisy so i got a coiks product for them. I can't justify paying for the Powerfactor when this works so well for the high power pedals with no hum.