Line Conditioner or New Power Cords?

Depends on what you consider to be reasonably priced. I'm using a Running Springs Audio Haley, which I was fortunate enough to buy as a demo. There are many out there. Some others that come to mind that I considered are APS, BPT, Richard Gray, PS Audio, and Exact Power. A lot of people seem to like the Shunyata products. What you'll find is that there are many philosophies to power conditioning. This includes active (such as balanced power and power regeneration) and passive (such as filtering) approaches. Many will claim to be non-current limiting and non-coloring. Only your ears will tell if their claims are true.

A dirt-cheap line conditioner will do better job than mega-priced powercord.

I'm running the top of the line Monster Power (very reasonably priced) AVS 2000 and HTPS 7000. Assuming your amps don't require 1000s of watts, this combo is nearly impossible to beat for the price.

I disagree with Marakanetz. "dirt cheap?" forget about price. Poor power conditioners can add some evil little nasties. I'm not a "Monster" fan, and it is a monster. Your most cost effective start to electric nirvana are dedicated lines for your analog and digital. Start there..

I would try CD/Dac/Pre into power conditioner.

Amplfier direct in the wall.

Build from there.