What is a better way to go for powering a 5.1 setup? A newer model that will have less power when running 5.1 but with Auto EQ (Yamaha RX-V 657) or a little older receiver that is sonically superior and has a stronger amp section without the Auto EQ (Pioneer Elite 43tx)?

My parents are putting together a new system for their family room (22'X16' w/ 12' vaulted ceiling). They want to go with all wall mounted speakers, probably 3 Axiom M3ti's across the front with a pair of QS8's for surrounds. They already have a HSU STF-2 (Christmas gift from their loving son ). This would seem like the standard crossover at 80 situation for the sub since none of the speakers are full range. My question would be this; For this room and this setup, which receiver would be the better choice? The Yamaha running all five channels is only putting out 40-50 watts I read somewhere. The Pioneer Elite I know can run double that with all five channels and probably produce a sweeter sound on straight amp merit alone. But, will the benfit from the Yamaha Auto EQ outweigh the benefit of the better sounding amp? The Pioneer does have manual MCACC, but my parents live 2 time zones away and really have no idea how to calibrate a system (think plug and play). For the price of the Yamaha, I could sell them my Pioneer Elite 43tx and upgrade myself into the 74txi (OK, so my intentions are not completely altruistic ). What is the best course of action for a good son who is looking to help out the 'rents?