Just get nero -- it works great for both data and audio cds (as mentioned above, be sure to burn audio cds using nero express as this makes it WAY easy to remove the 2 second gaps). Also, if you install mike wren's flac frontend after installing Nero, you'll be able to burn audio cds directly from flac files -- this has worked flawlessly for me under windows xp using both my old p2-400 and my new p4-2.8ghz. Although there is also a shn>audio cd plugin for nero, I don't recommend it as runnning it seems to choke my pc.
I've stayed as far away from ezcd-creator's products since they required me to reinstall windows xp a few years ago.