OP,
Typically you would not plug an amp or subwoofer into a power conditioner or distributor. They typically will restrict the dynamics. A high end power cord for a subwoofer is unlikely to make a noticeable difference.
For an amp there are two things likely to produce a significant increase in sound quality… 1) a high end power cord and 2) a direct line.
Given the way you phrased your question, it sounds like you have not done this before. So, it would be good if you got a very unambiguous positive result on the first thing you do. For that reason I would recommend using all your funds to purchase a single power cord… preferably trying several different options first. Buying used can double your purchasing power (typically sold at 1/2 price). Buying in the $1 - 2K range will get you a very good cord. One likely to have a very profound effect.
It would be hard to get a good power distributor and a power cord of any quality for $1K. This would likely be spending a lot of money and get something that has almost no / little positive effect on the sound.
A direct line will have a positive effect on all components… but if you have not experienced the result in the past, it will feel like higher risk because it cannot be returned and does not go with you when you move.
A dealer should be able to lend you two or three cords to try. Most companies produce special power cords for amps… they have heavier conductors because of the greater current demand. Also the cable company and others will rent cords.
Take your time read reviews in Stereophile, The Absolute Sound, and HiFi+. Most companies have many levels. You can go to the level you can afford.
The largest selling suppliers are:
Audio Quest
Transparent
WireWorld