My opinion on the matter is nonsense? Really? What's wrong with you?
I stated that your opinion -- that a HDMI cable gives a better picture then a dvi cable -- is indeed nonsense, as it's not based on fact. You might believe a HDMI cable gives better image, but it does not. You're entitled to your opinion, but that does not make the facts any less untrue. As such, I explained why it is so. If someone already has a DVI cable, a HDMI cable won't make the picture quality any better, since both are digital signals to begin with. DVI also has more then enough bandwidth throughput for DVD's. And the only way the audio might be better through a HDMI cable is if someone uses analog audio cables instead of, for example, a digital TOS cable for audio. But such cables can be bought seperately.
And upscaling is overrated; if it's on a bargain DVD player, it's nice, but it's certainly not a feature to get an entirely new DVD player for; it does not give you more detail, it simply tries to make up more detail, which has only limited results. DVD's won't suddenly look as detailed as Bluray, simply because they don't have the resolution. Upscaling won't help with any of that.
The topicstarter asks for options on how to make some of his DVD's look better. When I scroll through the replies in this thread, it looks as if buying a new DVD player with upscaling and buying a new (HDMI) cable would do the trick. But alas, unfortunately, it does not. I sure won't be the one to advise the TS on spending money on new equipment that won't change the quality of his DVD's.
Some DVD's simply are of low quality. Usually, these are either very old DVD's, DVD's from very old (animated) movies that haven't been remastered or DVD's that have simply been transferred wrong. You can't do much about that, except buy the "remastered version" in some cases, or complain to the company in the other cases.