Hi guys,signing on for the first time & already asking for help....sounds bad I know,but if you were aware of the depth of my technophobia you would hardly be surprised.

My prob is,I have been pondering recently about the value of upscaling and the various other video processing technologies built in to modern DVD players--i.e was it worth buying a player to upgrade s/d dvd`s and other video footage to h.d or near quality(as claimed by manufacturers??) in order to best display it on my proposed new h.d plasma screen.
I was quite convinced by the claims of the various dvd player manufacturers,such as how "their "chip(Faroudja,Silicon optix,etc.etc.)would transform even poor quality s.d video into splendid virtual h.d--in fact,I was on the verge of buying a player (I have a Philips DVDR dvd recorder,but this has no scaling abilities)
Now however,I have seen various opinions stating that the improvement in picture clarity,noise reduction etc. imparted by these numerous devices is way overated ,and in fact can sometimes be detrimental,as it can come into conflict with the sceens inbuilt scaling/processing capabilities .
So,now I am even more confused than ever--would some kind soul with a functioning brain please explain these things to me in simple(VERY simple) terms please?.
Does it work or not? To buy or wait for Blue ray/hd dvd?(it was meant to tide me over until the advent of one or the other,and in case they did not include capability to play my old library).
I apologise sincerely for the length of this question,but I am desperate
Many thanks in advance,cheers,dave.