Not to come of mean but, the answers you need would take about 2 hours to type out. Since each answer will create another 4-6 questions or contain 5 or more caveats. I would suggest you start reading in this forum and doing searches for question answers. This will net your far more knowledge faster than posting open ended questions.
Start with a google search of DLP vr LCD, you need to learn the difference in the 2 technologies and how they can play into your placement and room environment let along rainbow sensitivity.. This is a bit more complicated than buying a TV, considering all the variables of the room that effect your end image.
Good luck and don't get discouraged, you need to educate yourself and it is going to take some time. You will bet better answers if you ask specific questions related to a specific topic, so gather some knowledge on the basics it will be a big help and prevent a major purchase mistake.
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