Iv`e read a lot of posts lately about the benefits of a h.t.p.c. over progressive scan,scaling over this blah...blah...blah.. The reality is,whatever technique you use,you are limited by the resolution of the format-500 lines approx with dvd. You cannot get 2 pints out of a pint pot-the same as you can`t make 500 lines look like true high definition-whatever you do.. All you can achieve is a smoother image-sometimes at the expense of fine detail. I have tried all setups,and if you are going to be pernickety,the ultimate picture quality depends on numerous factors-the quality of the projector,line doubler,source,cables used etc..etc.. But..all things being equal,there is no significant difference between progressive scanning and line doubling(in essence the same thing)and scaling or/and h.t.p.c.(which again,is one and the same thing..). The main difference is that a super duper p.c.setup to achieve line doubling could cost you a grand.or..a progressive scanning dvd-500-700 pounds...this cost you would need to add to your projector cost(second hand barco or electrohome).. Or you save yourself the grief and buy a projector with built in line doubler(..such as the Ellie)..and any dvd player you like.. I would argue that their is a slight loss of contrast by feeding your projector with a h.t.p.c.-and it is an untidy and costly set-up...i would also argue that the progressive scan outputs on dvd players(..and in fact the internal process)are bog standard average at best.. So,a good scaler would be my money no option choice-but again,i must add that the improvement in picture quality is so marginal as to make this route a costly excercise. ..As i say,ultimately you are limited in the picture you achieve by the dvd format itself. You could upscale to 1024 x 1280-or,if possible.2048 x 2560(one day)-it aint gonna give you any more picture info!!!