Well it depends; are you running a surround set up, or are you only using the TV's speakers? With a great unit like the Pioneer, I hope your using it to it's potential.
Remember you can if you choose, get sound through HDMI. So if you are only using your TV for sound then you will either A: need enough HDMI inputs on the TV to accommodate all your components. Or B: have some sort of switcher much like your Pioneer. With the Pioneer as a switcher, you have all video and sound going in all the appropriate plug in's. It then distributes the sound and video from whatever device you want to hear and see on the TV, meaning SAT/VCR/DVD/LD...etc, etc. As for using your TV for the sound (which I still don't know if you are) then I guess first it would depend on you TV. I haven't used my TV for sound in about 7 or so years. As for the best quality HDMI is rated the best, but some still use Componant video. I am 90% sure you can use it for a 1080p signal which is currently the best (not 1080i), but you'd have to research that out. I'd just stick with HDMI (and don't be fooled and buy the most expensive, all hype). It is a true digital signal, you have it or you don't. You only want the sound cable, whether it is HDMI, or fiber optic (your choice), coming from its source DVD/SAT/Cable box, to the receiver. And remember, because the HDMI will carry sound, you have to set the receiver to use the fiber optic for the sound carrier (if that's what your using). Then the sound is processed, and comes out the speakers. Only thing you need is to see what you hear, this is the video cable that leaves the receiver and goes to the TV (usually label 'Monitor out')
I am glad to help, but you need to tell me if you’re using the receiver for surround (other speakers then the TV's).
I am off to bed, I'll check again in the morning.
Best of luck