I'll take the VT25 over the V10 over the S1.
*In My Opinion*, that price is not low enough for me to jump on it.
The better models will get you better blacks, 24p, THX mode, better calibration flexibility, and I'm sure other things as well. Good luck in your decision.
full disclosure: 99% of my viewing is bluray, so I regard 24p as a pretty important thing for my uses. I also watch with good light control, and so better blacks are important to me.
Again, it's just my opinion, good luck.