Monte, I agree w/ the advice here. Let me add a little bit about why everyone says "no" on the Center for music.
Most music is mastered in stereo. By "most", I mean probably 99.x%. Every album and most CDs. Selection is limited and price is high for CDs mastered in 5 or 7 channels.
If your goal is to get the most accurate reproduction of your source, that necessarily means stereo. If you use a stereo source and select Dolby PLIIx, or DTS NEO, or some other "theater mode" on your receiver for playback, your AVR will artificially separate the music into channels, including what goes to your Center. So no matter how good your Center speaker is, it is getting an artificial signal that combines elements of your Front Left/Right.
So I agree, for music, your most critical components are your Front L/R speakers. If your L/R are not extremely capable, the next most critical component is a good subwoofer.