D50 has a bandwith of what, 75mhz? so if cine 6 has only 20mhz like Ile said above, then you cannot really push it with any modern hd resolution like 720p..probably 576i or something like that..?
and 120 inch pic with that kind of resolution is not really a good idea. so do you have a chance to buy a D 50,.1030 or hs50? hs50 with double the price is probably still a better deal, if it has some factory guarantee left to it. for a 1030 i wouldnt pay anything like i said earlier, and a D50 should be inspected carefully since they usually have bad tubes..it does a nice 720p, I have one.