I think you are going to have to go LCD if you are going to mount it at 17 or 21 feet. Only LCD projectors in your price range have a long enough throw. LCDs are also quieter.
Personally I would get a $2800 Epson Home Cinema 1080p projector and make or buy a cheap screen. Otherwise an Epson TW-700 if you dont mind buying internationally with a world wide warranty (I am not sure where to buy). Or perhaps a panasonic ax100. I suggest these two as they are bright and you will need more lumens for a long throw. A Sanyo z5 might work if the room is completely dark.
If you really want to spend 1k on a screen, then a Firehawk or Silverstar (if you want a lot of brightness) are good choices.
Personally I would get a $2800 Epson Home Cinema 1080p projector and make or buy a cheap screen. Otherwise an Epson TW-700 if you dont mind buying internationally with a world wide warranty (I am not sure where to buy). Or perhaps a panasonic ax100. I suggest these two as they are bright and you will need more lumens for a long throw. A Sanyo z5 might work if the room is completely dark.
If you really want to spend 1k on a screen, then a Firehawk or Silverstar (if you want a lot of brightness) are good choices.