If you decide to go with the T/C I would suggest taking a long hard look at the other versions of the Encore, rather than the FX. Unless there is a huge price difference, I would spend a bit extra and get the interchangeable barrel feature. For several years I played with the Encore system, and had a number of barrels...centerfire, rimfire, blackpowder and shotgun. Very versatile, and a decent take-down gun for easy travel. I eventually got out of the system because I never cared for the appearance of them, and frankly, they handle like a two-by-four taped to a chunk of conduit...but I couldn't find fault with their reliability, accuracy and general quality. I don't think any of T/C's quality problems spilled over into the Encore line.
Don't know anything about the Knight line.