Good power conditioners do make a difference, but most high quality units with 4+ outlets start in the $500-$1,000 range (used). A $200-$300 power conditioner probably won't provide much more benefit than a power strip as far as 2 channel music is concerned.
One exception is Shunyata's Hydra-2 that will give you upper tier performance, but it only has 2 outlets. They can be had used for $200-$300 (I believe you can find them new for $400).
One exception is Shunyata's Hydra-2 that will give you upper tier performance, but it only has 2 outlets. They can be had used for $200-$300 (I believe you can find them new for $400).