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interesting beginning. I like it I think that the "claw" shifter should use dex/int as the effect stats and the "bite" shifter str/con. This reflects precision over brute force and both get the same amount of defensive bonus. It also sets them further apart which is needed. I kind of visualize bear for bite and cat for claw.
Another thing that could be included is some sort of movement bonus to the shifter depending on weather they want a brute claw or swift bite. I can see either one being fast or tough depending on what you want. Maybe X shift/encounter or shifty like the Kobolds?
Extra AC for a brute basher certainly seems to make sense.
Bite seems a little weak compared to claw as it is a +2 prof. instead of +3. Why the difference?
The attacks look good and the fluff is cool. A few stat errors (charisma instead of dex for the brutal bite) no big deal.
How about a third build, Horn/Tusk? This is more of a defender oriented shifter that gets the minotaur charge (powerful charge?) bonus and some sort of AC bonus (tougher skin?). Maybe 1-6 damage, the charge feat, and a +2 to AC with NA?
Could add a few "horn" at wills emphasizing toughness and charging.
These are the base attacks of course almost endless possibilites with monster powers, armor, defenses etc. Lots of different paths to take and oodles of paragon possibilities..
In addition why this direction as opposed to "you take the form of X monster"? Just a question as that would be easier to make.

I understand. The high critical is cool, but why not just include it in the bite and maybe reduce it to +1 or keep it at +2? Just a thought on how to further differentiate bite and claw.
I like the shifting into full other forms being daily powers and the choker as an implement is really good.
So Bite, Claw, Horn/Tusk (I suppose hoof but that sounds odd)? I suppose you could add slam, but most animals/monsters have something better than that (well if you exclude anklyosaurs, stomatopods, crocodilian tails etc.).
You could have all sorts of paragon templates (ooze, plant, animal, abberation, immortal etc.) so lots of choices there.
A very interesting class with lots of choices.
one more thing, you could even have a pre-build with one path being a defender and one being a striker before you get to the claw, bite, horn thing.
Maybe one way to go would be a build that has the shifter stay relatively "normal", but get heightened attacks, strength, defenses etc. to the base character and another build that the shifter actually becomes X creature. In the first build the bonus could be the items/implements could be used? Just another visual option.