My favourite CD Ripper has always been Lavavo, but it's not free.
This article has a list of some other free rippers to check out.
http://www.techsupportalert.com/best-free-cd-ripper.htm
If you do rip to MP3 format, make sure you set it at 320Kbps for best quality. Otherwise various songs will sound less bassy, or more tinny at 250Kbps or lower. 128kbps MP3s sound subaverage to my ear.
Regards,
Renato