A used Audio Magic Stealth MkII is in your price range. Six outlets, two of them specifically for digital. You can use it with your whole system. This power conditioner will extract tons of detail from your system, and sounds really great.
I have one that replaced the PS Audio UPC200, and the difference is night and day. Stomps all over it, and worth every penny of the difference in price.
If I had purchased it earlier, I may never have upgraded my Cd player and amp. It sounds that good. (Using it with a plinius 8200 mkII and Audio Aero Prima MkII CDP.)