Power Conditioner recommendations?

I presently have a very old power conditioner. I would like to upgrade and would appreciate any recommendations. My knowledge is limited so I prefer to purchase electronics new and I'd like to spend less than $300.00 if possible. My system is pretty basic: Yamaha N803 receiver, Yamaha CD, Vandersteen speakers, I stream Spotify.  I'm still trying to tweak without getting too expensive. Thanks for any help.  Doug