Larry,
I spent around $500.00. I only got the S-Bus Micro Receiver, up to 18 channels, 1 Channel Setting Tool, and 3 decoders. I ordered a Hub but ended up not using it. The Hub is really used for Digital Servos.
The nice thing about this you can still use your old servos using the decoder. I still have some analog servos, but have been slowly upgrading to digital. This can get expensive.
Boyd