If you want to upgrade many components simultaneously then consider the very top of the line Mapleshade Records power strip that does an amazing job of conditioning without resembling a traditional conditioner. It can make it seem that all your power cords have been upgraded. Just be sure that the distance between AC sockets on this or any conditioner allows room for fitting into adjacent AC sockets the physically bulky "hospital grade" plugs that may be on the ends of your power cords.
If you only need two pairs of IC's for use, first from CDP to preamp, and second from preamp to amp, then consider the lowest cost impressive IC's from Auricle Audio Design which come up for auction periodically. In a few systems, these have performed astonishingly better than their price would suggest. A truly unique handmade product from a one man shop that consistently gets overlooked in our busy Audiogon marketplace.
If you can move just a little further up the cost ladder, Reality Cables speaker wire will amaze you, once the optimized signal reaches your amplifier speaker terminals. Their IC's also compete at the highest level, still at very modest cost.
First step might be to "upgrade" all your components with the power conditioning, and then to reveal any newfound quality by insertion of quality IC's. Finally, getting it to your speakers. There is no absolute rule about which to do first, just a suggested sequence.