Buying a RX100 - a few questions

Hello!

I'm thinking about buying an RX100 but I have a few doubts, could you answer a few questions please?

1. MIJ or MIC version? What is it about? What is the difference?

2. Battery door - what's with the spring door or no spring door? Does it maatter?

3. Does the lens barrel wobble on widest FL and on full tele? You know - pointing the camera to the floor and try moving the barrel elements?

Does it have any play?

4. What is with the "Made in x/y" issues? Do I have to find any special version?

Thanks!