I feel pretty strongly that the M20's strong benefits in midrange neutrality, soundstaging abilities, and neutral (can be bright in a lively room) top octave make it a superb choice, and far better than the cheap-for-the-pound 60s. You may sacrifice some of the bottom octave whomp non-acoustic music, but you can add a fast sub if necessary.
The M20 will play plenty loudly in all but the bottom octave, and will be outstanding in the nearfield, too, where your 60's become incoherent. OTOH you can eventually find a pair of F30 around $2k...not that much more than the M20. The problem might be that soundstage and bass-balance requirements might clash. For my secondary (HT) system I use a Spendor front trio with a fast Boston PV1000 sub.
Perhaps a good fast sub and the M20s might offer the best combo, at roughly the same expense. Good Luck.
The M20 will play plenty loudly in all but the bottom octave, and will be outstanding in the nearfield, too, where your 60's become incoherent. OTOH you can eventually find a pair of F30 around $2k...not that much more than the M20. The problem might be that soundstage and bass-balance requirements might clash. For my secondary (HT) system I use a Spendor front trio with a fast Boston PV1000 sub.
Perhaps a good fast sub and the M20s might offer the best combo, at roughly the same expense. Good Luck.