I don't know whether you sorted this out yet. I've got both the Pocketwizard IIs and the Flex/mini.
The Flex/mini have more functionality, for instance they can use TTL metering remotely which the IIs can't. The mini is smaller than the II. They can do everything the IIs can do & a bit more
The pricing isn't too different so you might want to go with the Flex system for future proofing, though if you don't think you'll use off camera ETTL remotely & you can get a good price on IIs you won;t be disappointed, they are a great bit of kit.