From your text it sounds you already decided you want to buy a Power Conditioner. My questions is ... is there something wrong / missing with your current sound that pointed you in this direction as being the solution?
It could be that maybe if you change another component, or improve room acoustics, experiment with speaker placement or port (if they have them) tuning, improvements can be made that have more impact for the same or less investment than adding a power conditioner, which will probably only make a subtle audible difference, if any at all.
Since you say you have this budget cap, other solutions could be more money efficient. But of course the high tech looks and ’estheatics’ of a power conditioner added to your rig may give a nice feeling and may be worth something too.