you may try some of these new class-D amps. For example from PS Audio ($1.000), Lyngdorf (~ bit more than $1.500), NuForce, ... Your Quads do not mind having some additional Watts at disposal and these class-D amps have plenty to offer in that department.
The sound and synergy is something that I believe is the best if you check it by yourself.
The sound and synergy is something that I believe is the best if you check it by yourself.