I suggest you take a look at AVSForum.
They currently have a great
deal for a Da-Lite grey screen (which is preferrable for DLP FPs).
There are also many other threads regarding other brands & models and also DIYs.
__________________
Roman
"
Knowing I loved my DVDs, He furnish'd me from mine own library with volumes that I prize above my dukedom."
(That's what Shakespeare would have written today, right?)