Even downloaded MP3's sound pretty good on M80s, as long as they are 128k and up. If you want to play it safe get the M60s, they are a little more forgiving and at lower volume, with MP3s, you won't be missing the extra detail the M80s offer, as the detail is already missing;\).

nuc, if you are ever in Calgary I would be glad to give you an audition of the M80s- PB13 setup.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70