I am looking into creating my first HT and i have a few questions. i want a projector. Here are my questions: 1. what is this rainbow effect I am reading about? 2. what is better DLP or LCD? 3. how often do you replace bulb? 4. how will I know what size screen to use? 5. what is the diff. between XGA and SVGA? 6. what is the diff. in a business projector and a media projector? i work at circuit city and the 2nd link in my sig shows the projectors I can get, which would be best for the money? i am not a baller by any means so money is always a concern. thanks guys.