rickj:
so a dvd player connected to hdtv via scart will benefit from better pic quality because tv is hd?
Don't mistake upscaling with improving picture quality.
If you feed an hdtv with an sd source via any input the tv will have to scale that input to the native resolution of the screen. Scaling however is not something that will improve picture quality, in fact it is more likely the reverse especially if the scaler is a poor one. Very good upscalers can give nice results but these won't be found in dvd players of this price.
Scaling a source received over scart though will not produce great results so buying a dvd player that connects via hdmi or component would be advisable, however there is every chance that sending a none scaled signal via hdmi to the tv and letting it do the scaling will produce a better result than letting the dvd player do it itself.
Things also get more complicated when you start adding in de-interlacing as well as scaling