Many users prefer Soundtaxi like software, while many other stick to FairUse4WM and freeme2.

I dunno what ?7.70 is. Soundtaxi Platinum that removes DRM protection from audio files only costs $14,99.

You can read the following comparison to know some pros and cons of lossy and lossless types of DRM removal software:
FairUse4WM and Automate unDRM (drmdbg/drm2wmv) vs. Tunebite Platinum

In some cases freeware FairUse4WM works just fine so you don't need to install a fresh copy of Windows, learn about things like IBX and Windows Media Player rollback procedure.

And you should always test free trials before buying any software to make sure it works for you.