What amplifier do I need for a pair of PSB Image B25 speakers?

Specs:

Impedence
Nominal 6 Ohms
Minimum 4 Ohms

Input Power
RMS, Clipping < 10% of the Time

Recommended 10-100 Watts
Program 70 Watts

What brands/models?

Integrated or receiver, new or used, doesn't matter, however I do really care for the sound quality.

Thanks!