If I recall, the Yamaha is a pretty decent HT receiver but not high end. I don't think it even had gold plated jacks. However, does it have pre-amp outs? If so, you can start by adding a 5 channel amp. Add at least a 3 channel so the front three channels are equal. Even though you want good stereo, keep in mind that the center is the most demanding for movies; plus, keeping the front 3 equal will produce a great soundstage.
The Pioneer, B&W and even the CV are all decent buys that will produce great stereo music also. If your budget allows, replace the yamaha for a pre/pro/tuner and a power amp. You will be delighted with the better sound, better connections and probably a better remote.
The Pioneer, B&W and even the CV are all decent buys that will produce great stereo music also. If your budget allows, replace the yamaha for a pre/pro/tuner and a power amp. You will be delighted with the better sound, better connections and probably a better remote.