Amarra sQ is not listed there because it's the little Amarra application that plays internet streams only. It's $30 and the fancier version (sQ+) is $50. I didn't see Decibel there. It's a bare bones player of your server based music. It's cheap too at $33. I really like Decibel. It plays high resolution up to 24/192. I have Amarra sQ and I haven't really warmed up to it. 

To sumarize, Amarra sQ plays internet streams. Decibel plays music stored on your hard drive. 

I use Decibel as well for server based music. It's cheap and simple. It works and it sounds good. 

You may want to demo Amarra sQ for internet radio streaming. 

Or duh, save it from VLC file menu as playlist. If it opens in itunes get info on it and change to open in VLC.

If open with doesn't stick make the script for this playlist as described below. 

I just did this on my macbook running 10.6.8 and "open with" stuck and it's working as expected. 

Try this. Paste the stream link into your browser, hit enter, and start playing the stream. Drag the web location to your desktop. 

Here's the part I don't get but I have a workaround. Get info on the web location and tell it to open with VLC. For me this doesn't stick and it still opens in my browser. So....

Move the web location document to a safe place where it can live out of the way. Documents, for example.

Control click and open in VLC once to test.. 

Quit VLC.

Fire up applescript from the utilities folder. 

Have a window open with the web location available. 

Click record in applescript. 

Control click web location document and select open with VLC.

Watch it open VLC and start playing the stream.

Stop Applescript. 

Save as application.

Name it......RPVLC128 for example.

Quit VLC.

Double click new application to test. 

If it works hide it somewhere safe and stick it in the dock or create a desktop alias. 

Done in less than a minute.