I need a manual screen, no larger than 84" diagonal to replace my returned electric eBay 'cheapie'. I've seen the following screens: Optoma DS9084PMG+ (84" screen) .... £90 (1year warranty) Sapphire SWS180WSF-ASR2 (77" screen)... £120 (6 year warranty) Grandview cyber 77" manual... £270 (2 year warranty) The dilemma is whether its worth the extra to buy the Grandview screen, or opt for the Sapphire. But then the Optoma is a slightly bigger screen. Am I going to notice the difference sitting 3.5 metres away though? The extra size is important to me only if the quality of each screen is similar. Any advise/help before I order one of these screens .