Tunze turbelle on the market

[Willito]

I am considering the Tunze with multiple controllers and I am not too sure what's new or current on the market. Looking at J&L's website I do see a bunch of models available, but they are so confusing

If anyone could, please set me in the right direction. I guess I need to know what controller is good with what pump?

Also where is the cheapest place to for Tunze?