When you say DLP im guessing RPTV. If not then i think a 3rd M80 for the center would be a wise choice. I wish I had bought another M80 instead of the VP150 for our theater because It does sound different and I think it does have a hard time keeping up. When playing pink noise you can hear a pretty pronounced difference in the sound. Its not practical unless your using a front projection and a screen you can put speakers behind though.

When im watching movies i dont always think to myself how the center is not keeping up, because it definetly can hold its own but I do sometimes think that it might be better being an M80... If Im ever real curious I will take one of my 80's from my stereo setup down to the theater and try it out!