I have been reading about scaling and dvi etc and would like to ask those more knowledgable if I understand ok, From my understanding scaling can occur at 3 levels, in the source (e.g. dvd player), via an external box and/or in the screen (in my case this will probably be an lcd). I presume if scaling is done only once and with the best scaler (whereever that lies amongst the 3 levels) and kept in the digital domain in the rest then that would be better. Then the transfer in the digital domain will also lie on the quality of the digital interconnects. I presume if the display screen cannot take 1 to 1 pixel mapping from an external scaler and/or dvd scaler then that means that one with have 2 scaling operations anyway and hence theoretically will probably introduce more artefact. Now I think sdi means that the signal from the disc is taken unprocessed from the dvd in digital form and therefore bypasses the disc processor, this then can be either passed to a screen or an external processor (naturally the latter being a more expensive option). Therefore the best picture connecting dvd directly to screen would be: 1. If the dvd player does not have a scaler - sdi output to screen. Even if the dvd player has an hdmi output I would presume there would be more processing anyway due to HDCP and therefore the sdi output would be superior. 2. If the screen scaler is better than the dvd scaler - SDI dvd player feed direct to screen 3. If dvd scaler is better than screen - dvd scaled and passed directly to the screen, unless the screen rescales the feed anyway (as it cannot perform 1:1 picture mapping) Of course if one has an external scaler then the 3rd tier would also apply but again benefit would probably depend upon the display accepting 1:1 pixel mapping from the scaler (at whatever resolution). So really what one needs is a list of which scalers/ scaling chips are better and where to find each!. Personally I am thinking of making a future purchase of the next generation Loewe spheros lcd, this is supposed to accept 1080p feeds but I am not sure if it does 1:1 pixel mapping yet. If one assumes it does then the best picture would then be simply dependant on scaling; given that I cannot afford an external scaler yet, then the best picture from dvd I probably will get, will be I presume an sdi-dvd player connected direct to display, or at a second an hdmi-dvd player connected to a display. As sound is equally important and as I have an Arcam AVR then if I think down the Arcam route then it probably would be an sdi Arcam 29 or would it be easier and equally good just to go via a straight Arcam 137 without sdi. Naturally this is currently theoretical and suggestions or corrections to my logic would be appreciated.