[will27ns]

Is StreamboxRipper good for this task?
Are there better programs to use?

[Stream Recorder]

Why do you need to convert MP3 files to WAV? How many files do you need to convert?

Sometimes I use free audio/video conversion software (http://all-streaming-media.com/convert-audio-video-files/) like SUPER or MenCoder.

Also some CD/DVD burning software programs like ubiquitous Nero (http://all-streaming-media.com/CD-and-DVD-burning/Nero-Burning-ROM-CD-DVD-HD-HVD-Blue-ray-disc-burning-software-Windows.htm) allow you to burn Audio CDs from MP3 files directly, so you don't really need any audio converter.

[will27ns]

Yes, basically I want to burn some MP3 files to Cd. My Cd burning software is Sonic RecordNow! v.6.0

[Stream Recorder]

Then try to add MP3 files to your Audio CD with Sonic RecordNow. If it can't do that, you may use any audio/video conversion software (http://all-streaming-media.com/convert-audio-video-files/) that supports batch conversion, like free MediaCoder, SUPER or StreamRipper, for example.

[Themis]

Take a look at SoundTaxi converter (http://all-streaming-media.com/remove-DRM-protection/SoundTaxi-Convert-DRM-protected-music-from-Windows-Media-Player-iTunes-Napster-Yahoo-Music-Rhapsody.htm).
It's possible to remove drm with it!