Vortech is ok, I am not the biggest fan of this design primarily due to it its hyped abilities. Water will take the path of least resistance, the vortech distributor does not change that. Extensive testing has shown that a properly sized gravel bed is almost as good. The Vortech designs are difficult to service and we have had several issues that have occured primarly during shipping (not the Vortech fault, trucking company abuse) that has made it necessary for the systems to be sent back for repairs vs feild repairs. A good quality distibutor and manifold is cheap and easy to repair even by the DIY.
Upflow Calcite media... sometimes necessary, not totally bad, I am not a fan mainly because in situations where the flow rate will be changing constantly, the neutralization may be limited and channelling is common. In a downflow system, channeling is not a problem regardless of flow rate. I prefer a backwashing calcite filter when possible. Good applications for an uplflow neutralizer are post commercial RO where the flow rates do not vary and backwash water is simply not available.
The recommended flow rate of a 13x54 calcite tank is 2.8-5.6 GPM, this is ideal for a typical house as the flow rate will rarely exceed 6 GPM.
Softener, Fleck 5600SXT is a great valve, the WS1 is as good if not better and the cost is identical. The clack is also a better match assuming the upflow calcite tank is using the clack 1400 head with fillport. They use the same plumbing connectors and bypass assembly.
The equipment they are recommending should work perfectly for you, the backwashing calcite is only a minor preference, but in the real world, either would be fine. You will also save a lot of money by using the upflow system since you are not buying another controller.