Those are all $400ish AVRs. Out of those I would take the Sony for the wifi and BT because it would be useful to me. CNET and Sound and Vision gave high marks to the Sony. The Sony probably has the most power.
The Denon has Audessy which seems to be popular here, although CNET noticed no real difference compared to Sony's room correction implementation.
The Yamaha has the most "features" as far as DSP modes and has the better GUI but likely the weakest amp, not that it probably makes much difference.
If you step up to $700 it opens up a whole new level of AVR, like the Pioneer SC1222, Denon 3312, and such.
Klipsch RF-62II, RC-500, RS-400, SVS PC12+,
Def Tech SC8000
Harman Kardon AVR 1600
PS3, Apple TV, Sharp 70" Qattron