There is a new GoPro Hero4 Sessions... but the reviews are not that great. I also have a Hero3 Black and a Hero4 "basic"(its hard to go wrong at $120). But what I don't like about the basic is the camera has a builtin battery and is permanently mounted inside the waterproof case. No external mic or mini-HDMI ports either.
I think the Hero4 Silver makes the most sense IF you have some GoPro mounts already.
Checkout my GoPro thread here.. (for some comparisons)
http://www.1addicts.com/forums/showt...=810802&page=6
GoPro Hero4 Sessions...
Hero4...
