Hey Seth, you may want to do a little more research before betting
. HK tends to state their output power conservatively, but BS aside, the 110WX7 Pioneer will still have more output power than the 50WX7 HK. The Pioneer also weighs more (10%) and its power consumption, at 450W vs HK's maximum 540W is another indication. HK is among a few that specify maximum power consumption, most others seem to provide a nominal number that is not maximum (2 ch at rated output+X% of the remaining channels). The maximum consumption for the Pioneer could be much higher than 540W. HT mag tested a VSX-816 at 5X79.3W into 8 ohms and 2X155.7W into 4 ohms all at 0.1% THD. The VSX-1017 should do much better. Conversely, last time I checked lab measurements for HK's mid level (330 if I remember correctly), the numbers weren't that great and the protective circuit tripped during the 4 ohm tests.
Again, we all know HK rates their output conservatively/trufully, but on a Watts/$ basis they don't do too well. I am not favoring any of the 3 the OP was considering, but would have suggested that he does more research in order to make an informed decision. HK does make nice sounding receivers. The 347 is no doubt a good choice if his main goal is sound quality.