Out of all the new Bionicle figures which do you recommend?
The three 20$US sets are hard to go wrong with (Though of those three I'd prioritize Kopaka and Tahu for a nice supply of gold and Trans-cyan ) Of the 15$ dollar ones I'd say Gali and to a lesser extent Pohatu. Gali has the most pieces after Lewa at that price point (IIRC), on top of having a solid, simple color scheme (and trans-blue pieces!). Pohatu has a color almost never seen in CCBS sets, so he's worth it for those parts alone, he's also probably the most flexible out of all of them due to how lightly armored he is.
Lewa isn't bad, but you have to do some finagling in order to give him an acceptable degree of head articulation. The default instructions make his head practically unposeable. If you get him, make sure to attach the gear/arm chassis so that the bottom peg is parallel to the ball socket the abdominal/chest armor attaches to. The default instructions have the Gear chassis too high. This makes the gearbox combined with the shoulder armor restrict his head articulation severely and makes it nearly impossible to move it even slightly without accidentally flipping his mask off (which is still a bit of a problem with the other sets, but not nearly as badly). That and I'm personally not very fond of his color scheme (Pastel Orangey-Yellow and pearl silver together are yucky when neither is the primary color. The gunmetal weapons and relative lack of green don't help).
I have no idea about the protectors.