I thought the panny was more than the RS45, well at least in the US. I thought the 3D was just ok, but not great from what I read. So, I would choose the RS45 because its cheaper, and 2D movies are better. To conquer any brightness limitations with projectors, get a HP screen. For sports, the JVC is decent, but I only watched sports on a JVC projector with a HP screen. Motion was about the same on my RS40 and 55 as my Panasonic ae4000. I couldn't see a noticeable difference with sports.
Right now, I'm using a Benq W7000 and sports are a lot better, a noticeable difference, and 3D is in another class. It really depends on what you watch more. There really isn't one perfect projector for everyone. Some people watch strictly movies, others sports, etc... For me, I watch everything, I have been through almost 10 projectors in the past 3 years, trying to find the right match. Good thing is that they are easy to sell with little lost. I am able to do a 3 projector set up, so I don't have to worry about finding the right projector, just the right combination.
I also have a cheaper $400 Acer H5360 for use when friends or family wants to enjoy something on the big screen because I am not going to waste hours on my main projectors so my brother can watch sportscenter or my nephew can watch cartoons. So, if you can do a 2 projector set up, you can get the best of both worlds. But the panny is overall a better projector than the RS45. My panny ae4000 got me close to 3000 hours and I'm sure the JVC will probably max out at 1200. If you are not willing to do a 2 projector set up, you will miss out on the things that the panny does better than the JVC. The JVC is strictly, imo a 2D projector for HD material. The panny also handles lower sources better than JVC. I don't know why but my Benq does too, I would assume the JVC would but it doesn't.
Edited by blee0120 - 7/12/12 at 11:35am