Honestly after playing around with the NX2 Se's, stick with regular AT's or RS's. The toe cap just wont give you the support you need for what aggressive type of riding I assume you're planning to do with these freeride boards.
There really isn't anything to worry about regarding ride when it comes to the two new N series that have the I strap, so those stay.
I don't think the Union stuff will cut it. They just aren't on the same response level as your other options.
So, I think either Targa's or NX2 AT's. You could do RS's but I think the AT's will be fine, and save you some money.