<< GoldWave or CoolEdit 2000 is my recommendation. >>
Download the trial versions of these and try them out before you buy them. I just went through the same thing as you trying to record audio tapes and burn them on a cd. I was recording some mono tapes of voices not music but found out a lot about both. I tried out the above mentioned software and found it was ok, but both were lacking. Neither one had all the stuff I needed to make easy copies. I finally my used Roxio Easy CD Creator 5 Platinum which I already had but didn't know how to use the audio editing software. It gave the best quality playback and though the interface is a little wierd, it has everything I needed and it was easy to use. Goldwave was simple but I didn't like the quality, and Cooledit had the best quality of the free stuff but it was too complex to figure out all the options and graphs. I liked Roxio the best becuase of the ease of use, I didn't have to configure as much stuff to get it to work well.
One problem I ran into was setting up the hardware to record it. I finally had to use the micophone-in on my sound card which worked just fine for what I was doing. I just had to adjust the input volume on my stereo and the input amount in the software. I tried everything to get it to work with my audio-in jack but no success. Stereo recording is more picky when your recording, the quality of the input(source and hardware getting it there) makes a big difference. I could never get it to sound real smooth without a little distortion like popping and other things with my cheap setup.
<< now I have a problem. I have my tape deck hooked up to my breakout box and when I play the tape, it plays through my speakers, but neither nero or goldwave will record the audio >>
Check what source the software is trying to record from. If I remember correctly you have to configure what the source is going to be on some of the software. That is why I liked the Roxio software, it did everything for me.
Also if these tapes are from a mono source like a hand held or something, you can get a lot higher quality and save some hd space if you record them in mono at like 44 khz. It is amazing how much space an audio tape will take up. I got real good quallity at mono 44khz and one side of a 90 minute tape only took up about 250mbs.