Need some advice on HTiB.

Now eyeing on Pioneer, but if i check for the spec, from HTZ 170DVD till HTZ 777DVD all having the same watts on speaker, which is 60 RMS per speaker. So can I assume the sound quality are same, just design differently?

On the other hand, I also looking for Pioneer EV70DVD, due to 100 watts per speaker, logically should be sound nicer.
But it should be miss out the HDIM port, if use this unit & compare to HTZ series to FHD panel can it be much different on picture quality? I mean based on DVD, not Bluray.

If the price more than 1.5k, then is not worth to take HTiB. Or maybe some shi fu got better recommendation?

Any Pioneer HTZ expert here to comment?

Another question, If I use the same source, DVD9(7.5GB+) from a dvd player thru component, progresive scan to FHD panel, compare to use a dvd player with HDMI playing the same dics, does it show any different? Note: My source still the same dvd9, not blu-ray yet.

I know if blu-ray, sure HDMI doing the good job, but just dvd, does the HDMI thingy make any different?