How important are power cables and power filters?

[voice of the theater]

Ok, maybe the whole story about cables and shielding or filtering is bull shit, I don't know.
The only thing I know are opinions from other people or reviews everywhere on the internet.
The best way to be sure is to try out something, and I read some good reviews about the DSS NZ 4000 power filter
http://stores.ebay.com/DSS-Verkauf?_trksid=p4340.l2563 I think I'm going to buy this one for a try out.
And for cables Furutech seems to be very good, but I think much or 2x much to expensive.
So for the cables, shielded or double shielded, there must be a much cheaper solution.
That's my first "job" tomorrow, find some good cables, and find out some prices.

Nothing beats trying something out for yourself. You can read all the reviews in the world, but often times the only review that really carries much weight is your own. Not to mention when you try it out yourself you see how something performs under your specific/actual conditions--not how it performs at someone else's house under different conditions. If you're going to spring for some of this stuff and if it's expensive (like a power filter etc. might be), some places let you return certain items within 30 days if you're not completely satisfied for any reason--those are good places to buy stuff that you want to "try out" that you're not sure will work for your specific application. One reason I posted about the $147 duplex outlet was to give you an idea of how much money people will waste chasing rainbows/throw at a problem.....