I figured i'd just reply in here to your question in pm.
I couldn't find any hockey to watch, but put on some football and had the screen rolled halfway down so I had the jvc x35 overlapping with my Samsung f8500. I also zoomed out as much as possible so that size wasn't playing as much of a factor. the plasma is 64" and i'd estimate the projector was down around 80"
anyway, I THINK the Samsung was smoother when it came to motion, but to be totally honest it was really subtle to my eyes. as I said before, I've never been bothered by motion blur, but I was trying really hard to see differences. as far as what was on center screen, I really couldn't. when the guys were running, or the ball being thrown, those things looked about the same to me. the differences I thought I saw were in the background, the stuff not in focus. so say there was a guy running down the field, on both displays his fast moving legs looked clear, but on the jvc, the ppl standing on the sidelines looked more out of focus than on the Samsung.
overall, i did not find it distracting or troublesome. what i did notice was how badly i need a better screen for the jvc. the Samsung really looks so much smoother and clearer compared to all the screen texture and sparklies i see with the projector. the one thing that really shocked me though, was the fade to black was actually very noticeably darker on the jvc(with grey screen) than on the Samsung plasma. even with a bit of ambient light, i was not expecting that at all.
anyway, it is my opinion, that while the jvc, and lcos in general may not be the best for motion handling, i certainly didn't find it to be a problem watching football. having not compared it to the sony, Epson, or a decent dlp i can't make too bold of statement though. i'll simply say for my eyes, it's not an area of concern, and not something that i would trade blacks or contrast for. if the sony is at all worse in blacks and contrast, i would prefer the jvc.
on the other hand, the 600bux you save, is ALMOST enough to pick up a 1070 or something DLP to play all the sports you want. so i think i'd recommend the jvc, try it out and if it's not quite there for the fast stuff, grab a cheaper dlp for that. you don't really need to worry about deep blacks for sports, especially not hockey, haha.
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1130K, 7.1/5.1.2 audio
Sources: HTPC(Enby), PS3, XBOX360, Wii
Control: Harmony One