If they must be a flagship model then the obvious choices are the Yamaha RX-A3050, Denon AVR-X7200W and Marantz SR7010. The Yamaha and the Denon both have the higher end DACs and the Denon is actually the real flagship among the D&M products. For me, the choice would be the Denon but only because it comes with Audyssey XT32 and Sub EQ HT that works well in my setup. If you don't care for their built in Room EQ and bass management features then you can flip the coin or go with Yamaha for their seemingly (no proof really) better reliability record. Both should compare well with, and likely better than the Pioneer in terms of sound quality, theoretically speaking, based on available specs, and their predecessor models bench test data. Note that my comments refer to the prepro part only, assuming you will continue to use external power amps.