What do you "air gun/pellet gun experienced" think of these?
http://zxgun.biz/catalog_detail.php?product_id=16188
http://zxgun.biz/catalog_detail.php?product_id=11650
Without going back through the posts, what exactly are you wanting a gun for? Shooting predators? Have you ever owned or shot a rifle? An accurate rifle is only accurate if you train with it. If you are restricted by law from firing firearms on your property, then I get it, but if you're out of town, forget that pellet gun and get a single shot 410 shotgun. You can get one for half what that pellet gun costs and a scatter gun doesn't require the skill required to hit something with a rifle.
Another point is that actually killing an animal with a .177 air powered pellet takes a truly exceptional head shot. A chest shot is very unlikely to penetrate deep enough to do lung and heart damage, leaving a wounded animal to either, recover, fall to a predator, or die a long and miserable death from blood loss or infection. Do the job, but do it right.