Another welcome kwk1,
To get an email update on thread responses, just add the thread to your watchlist under topic options, then in your watchlist, choose the edit watchlists option and select the email notification immediately radio button.
As for center channel, the best option is another M60. Having 3 identical speakers for LCR is the best. However if this is not practical, then look into either the VP-160 to match the M60's, or an option I highly recommend is to use an M22 or M2 as a vertical center channel.
And for music playback in general - I always listen in full surround, even when the source material is a regular stereo CD. I let my receiver decode the signal using DPLIIx or similar method. I find the sound much more pleasing in surround than straight stereo (or 2.1).
Hope that helps.
