I am having two screens in my mini theatre, i hope you have seen my blogs, i am having a 72 & 82 inch screen, one is dnp, fibre based from denmark and the other is dalite which is operated via projector, the screen rolls down and up based on the projector light, the dnp is a advanced one, not more than 5% of them would be having it in their home theatre but it is very expensive, if you need the contact details for these screens than do let me know, for cheaper screens, they are available in hyderabad. If you are interested in dalite at a compitative, price than do let me know. I need to tell you that please compare the price and brand with 3 leading shops, because the price difference which i saw was huge, i was lucky that i did not fall in the trap of over charging, i have given many of the points in the forum, tips for making a dedicated home theatre.
I strongly recommend contacting Harsh Thakkar. He is a pioneer in this industry and very well respected. He can pretty much get you what you want and is a real master at home theatre set up and custom installations. He is based in Worli, Mumbai. His contact details are 24915886.