Power Conditioner Cheap?

Ive been looking at PureAV and panamax mainly as well as chang. Really dont know which one is better as i believe they all have lifetime warranties and im not sure if levels of cleaning/filtering is a world regulated value or they just make up different stages and levels in different companies. I was comparing a panamax 4300ex against a p31d pureav unit and a chang CLS-3200 mark2 all in similar prices but i think the retail on the pureav unit is the highest. "Filtering levels" are stage 4 on the pureav unit "level 5" on the panamax, and from what i read the chang is simply "fully filtered" no idea where to go or what to do. any input would be great. As for number of outlets i need, im not sure if i should be using switched outlets or not but if i hook up all the units in the room that would be 1 amp, 1 dvd player, 1 HD cable box, 1 CDP so a minimum of 4 outlets I would say. IDEAS????