That depends a lot on your power source and how bad it might be. I put 3 Cardas Golden Reference power cords on my Arcam AVP700/P1000/DV79 and Merlin TSM-MX's with very good results, making a very smooth and tonally neutral combo even smoother. Especially notable was dialog for movies which became even better defined (with phantom center). Video was about the same as far as I could tell. On a'gon, CGR PC's are actually pretty reasonably priced relative to many cords.
When I inserted a Sound Application Reference LineStage power conditioner from my 2-channel system briefly, I wish I hadn't because I can't really afford a second one. The video was much cleaner and dynamics were improved for audio. The background seemed blacker causing dynamic changes (quiet to loud) to be much more distinct. I just couldn't justify the cost, so I'd say, at least in my case, the power cords came first but were definitely worth it. A power filter with lousy cords is still going to sound rather lousy, so I'd probably go with the cords.
When I inserted a Sound Application Reference LineStage power conditioner from my 2-channel system briefly, I wish I hadn't because I can't really afford a second one. The video was much cleaner and dynamics were improved for audio. The background seemed blacker causing dynamic changes (quiet to loud) to be much more distinct. I just couldn't justify the cost, so I'd say, at least in my case, the power cords came first but were definitely worth it. A power filter with lousy cords is still going to sound rather lousy, so I'd probably go with the cords.