hello, i just got my hitachi PJTX100 in. Just deciding on a appropriate screen size and brand. Any ideas? I sit about 15 feet away from the picture, and the maximum length is 10 feet across (as thats the length of wall screen will be on). I haven't mounted the projector yet, was waiting on screen first, so just using wall for now. I basically will use projector for DVD's only. Thanks for any answers!