Hi - SnapDrive 6.4.2 is now the main available download from the NetApp NOW site, so this would be the best version of SnapDrive to use.
There is a First customer release of SnapDrive 6.5 however this will definitely be revised in the future.
SMSQL - you want version 6.0 as this supports some of the new features of SQL 2012.
http://www.netapp.com/uk/products/management-software/snapmanager-sql.aspx
Cheers
martin