I'm curious if FLIR intends on bringing out any thermal scopes with 640 resolution? I'm very interested in the PTS536 model since the PTS223 just isn't enough for the longer range applications I'm looking at. I've also had my eye on a Pulsar XP50, but I hear a lot of issues with them holding their zero, along with some temperature issues. So that being said, I have a $4,500 budget and would like either or Pulsar XP50 or equivalent. So let's hear it, what is the cat's meow in terms of thermal for my allotted price range?