I myself just started to research going all electric and using a controller to somewhat automate my setup last weekend. After countless readings on the HBT in the past week I ordered an Auber PID Temp Controller and a Solid State Relay (SSR).
I wanted to become familiar with the process so I wired up a simple circuit using a lightbulb to simulate a heating element.
I think this video might be helpful to those thinking about going electric or just getting started in the world PID's, HERMS and RIMS.
In the video I first mention I have two leads coming from my switch, one going to the PID which is true and one going to the lightbulb which is false. The second lead is actually going to terminal 1 of the SSR, and the lead from terminal 2 of the SSR is going to the lightbulb.
Also, someone has mentioned it previously on here but as I was browsing Home Depot today I noticed they had a Spa Disconnect Panel for $35 rated at 60amps 240v. That's one hell of a deal if you ask me.