Low impedance speakers always make me tend to veer toward separate amplification - too few receivers offer amp sections that can really do their best work with such speakers. You could give the Model 1070 a 30-day trial, but if you have 4 ohm speakers in the system now you might also consider the 1070's processor sibling the 970 and a separate amp like the Model 7125 (7x125) or the Model 7075 (7x75), both of which should be comfortably up to the task of low impedance speakers. The 970/7075 combo is $1300, although I'm not sure that the 7075 has started shipping yet (if it hasn't, it should begin shipping this month). The 970/7125 would be $1600 and would be available for shipping immediately. If you really don't need more than 60W or 70W, though, 970/7075 would give you 75W that should have no problem with tough loads for only about $400 more than the 1070.