I'll bet your software already has the ability to convert mp3 files to cd audio files. Look through your burning preferences for a CD audio option, or to convert files to AIFF files (which is the cd audio standard). You could also check the help file of your software and ask it how to burn mp3 files as cd audio--if your software doesn't support this I'm sure it will tell you there.
If it turns out your program doesn't convert mp3s into aiff files, then there are lots of other options to choose from. Go to either
**EDIT**, download.com or tucows: all three sites have a variety of excellent players/recorders for a variety of platforms. If you're a Mac user, then I highly recomend iTunes. Music Match Jukebox is a cross platform player that is also excellent (the Windows version is far superior to the Mac version, alas).