VPLEX Model and Licencing

I am proposing 2 UNITY600 Hybrid with VPLEX METRO Local for higher and continuous availability solution.

Based on your experience, could you please reply my answers as below:

1. framing license for 2 Unity600 is enough and I don't need to buy capacity based license ?
2. VS2 is fine or I have to go with VS6 ?
3. I will have both UNITY in one DATA CENTER. VPLEX METRO has better functioning or LOCAL is fine.
4. 1 x VPLEX engine Dual Director should be ok or I need 2 VPLEX engine ?

Your valuable advise appreciated.

Thank you