If you find that your baseplates have to much motion, then take them to your local pro shop and they should swap them out no questions asked. They had trouble with some of the 07 baseplates, but they will fix them for free; if your local proshop wont swap them for free, Ronix will.
Ronix has good customer service and if your board/bindings become faulty, just call up Ronix and they will handle it.
And i give a yes vote on the J-bars, i did not us them in my 07 ONE's but i am Currently in my 08's. They give you alot better support and a more "locked in feel".
The 07 Covin board is safe bet, as ronix just changed the graphics for 08, not the shape, so you would be paying alot more for different graphics if you went with the 08.
But they did change their bindings, the 08 whole 08 binding line (excluding the ONE, which underwent internal changes) has shed up to 20% of their 07 weight.
Im on the 08 ONEs, and they have greatly improved from last year. They hold like no other bindings i've ever worn.
Either way you cant go wrong, Ronix is totally sick.