While attempting to archive my video collection, including hundreds of HD movies captured from my Tivo in 1080i, I am looking for input on acceptable bit rates. I am converting to mp4 and mp2 using VideoRedo and MeGUI. With a 1080i video in mpeg 2 with 5.1 DD which has a bit rate of +/- 18Mbps, what can I generally get by with when reducing the bit rate in mpeg2? mp4? If I downscale to 720P@ mpeg2? mp4? I appologize if this sounds like a first grader to those of you experienced in this sort of thing, but I am probably in Kindergarten when it comes to video conversion.