If you want a fixed frame screen, which are the best due to no wrinkles etc., then I don't think you could do better than a Carada for the money, see
www.carada.com . Audioholics have compared their brilliant white material as very close to the Stewart studiotek 130 material, which will cost considerably more. You buy direct from the U.S. & my 88" diagonal (76.7" wide viewing area) Criterion with Brilliant White cost about £630 including taxes & shipping. They are awesome screens, sort of like what SVS are to subwoofers, ie fantastic quality at unbeatable price due to buying direct. David Giles, the owner, is a top bloke & can advise on everything. Screen is easy to assemble, loads of great feedback from people on
www.avsforum.com as well as here.
Some may say that the Optoma H79 is better than the 7210. It may have a better black level, but I don't think the video processor is as good as the 7210.
However, if you did fancy shelling out around £1500 for an external processor then the H79 may be the better choice. Or, the ruby