AC power delivery and Power conditioners.

I have a dedicated audio room which is on its an own curcuit . I have just installed 3 additional dedicated lines for my system. Thus I have 4 in the room. The 3 system lines are from the same bank of the power box. The room line is from the other bank so is opposite in phase. I use a MAC mini as a server and power it from a APC Power conditioner with battery backup. I intend to use one of the dedicated lines to feed a power conditioner for digital front end (DAC and Disk player), one for the preamp, and one for the amp. I have a audible Illusions 3A pre with external power supply. Should I purchase another power line conditioner for the pre, and if so any suggestions? As this project is not 'a done deal' I would also entertain on any aspect of this endeavor. Thanks in advance.
Your next decision that you need to think about as far as power conditioning is concerned is passive,transformer,or regenerative type and your power requirements.If you go with passive ,an ep2050 and 2750 at the circuit panel would be a good start.
You might want to call The Cable Company (who has a lending library) or another retailer that has both 1) a lot of power conditioning experience and 2) a good return policy. They can guide you to what they think will be best in your particular system with your AC.

But it seems that power conditioners are considered to be system dependent. Some conditioners work well with amps, others do not (it is often recommended to plug amps into the wall and everything else into a conditioner).

From my experience, I'd suggest looking into Equi=tech (or maybe another balanced power conditioner manufacturer), Running Springs (often toucted as being good for amps as well as all other gear), and Audience (while not perhaps the ultimate, I've seen recs of using their 1 and 2 plug units with a power strip like the Wireworld Matrix).
My experience with APC (I have an S-10) has been superb with tube and SS amps and preamps. My Quicksilver M60s plugged into the wall passed a tremendous amount of AC noise. Plugged into the APC...dead quiet. The APCs have also received great reviews, are effective, and affordable. I see no reason why what you have should not work perfectly with your gear, preamp included. BTW, if you have any SS that does not have start up protection circuitry and leave it on 24/7 (as I do), your speaks will thank you when an outage comes along.
I agree with Rosceiii, consider a balanced AC power unit.I use a BPT that has 20 amp capacity and it is excellent.My entire system is plugged into it.I`ve had mine 4 years and it is worth every cent I payed for it.
Ditto. I have been using balanced power for almost 9 years now. Highly recommended.
Isolation of digital is vital to great sound.
I use separate balanced power isolation plus additional
conditioning for digital and the improvements have been incredible. My pre & amp are on separate isolation and conditioning for each. It's well worth it for the clarity, dynamics, transparency and nuance that you will "never" get without similar treatment.
That is how I also do it. Each component on its own dedicated isolation transformer.
Thanks everyone for your response. I will look into balanced power transformer. I am not familiar with them. Mike

take time to eval your system w/ those dedicated lines. You may not require anything else in your rig.

Happy Listening!
Look at products by Equi=Tech, Torus Power, Furman and Balanced Power Technologies (BPT).