The problem with following rules-of-thumb is that they don't always apply (and IMO NwAvGuy is a questionable source), AND the AKG flagships are an exception to the rule because they have a rather flat impedance curve. Unlike many Sennheisers, the Q701 doesn't have frequency spikes when there isn't much dampening, so the sound quality is more dependent on the rest of the audio components.
FuzzyKiwi,
That pioneer looks decent, I say try it (won't hurt). You may have to turn up the volume a bit more, but the solid-state amps in receivers like that produce more than enough current to create smooth, strain-less/effortless sound. I used my Q701 with my $200 Yamaha receiver, I bet you'll like it with yours too.