I think you are going to get varying opinions on this topic.
Back in Febuary I purchased a Synergistic Research Powercell 10SE power conditioner and haven't looked back. It cost a junk load (MSRP 5K), but I haven't regretted spending that money for one second.
I plug everything into it, amps, preamps, sources, recievers, etc, etc, etc, and it has made my system super dynamic, very natural, very silent, great black backgrounds, and amazingly three dimensional.
I always thought people were insane when talking about during stereo reproduction they could hear sounds coming from the sides and behind their heads until I got this SR 10 SE power conditioner.
YMMW; but I wouldn't go back to not using a PC.
In your price range, the uberBUSS and MagikBUSS are supposed to be excellent. Danny from GR Research circle has the info.