<font color='#000000'>I can answer a couple of your questions.
The power bar you choose depends on your budget. I have Monster HTS-2600 ($300-350). It is a component power conditioner, which means it sits on your A/V rack like the other components. There is a big difference in sound when you use a power bar/conditioner. Everything sounds and looks better. Basically, your electrical signals will be cleaner, with less electrical interference. Listen to your setup without a power bar...then instal one...you'll see (and hear) a difference. I reccommend using one.
As far as Dolby Digital and DTS are concerned...DTS is not a Dolby product. Dolby Digital and DTS are separate, competing companies. They are both surround formats. DTS technology is superior, and it sounds better, especially with 5.1 music. Dolby Digital signals are compressed to a greater extent than DTS signals. Increased compression equals decreased dynamic sound upon playback. Almost all receivers have both DTS and DD. The format used for playback will depend on the format the source was recorded in. DD is more common than DTS.</font>