Which Tunze "system" should I get for a 90 AGA?

[Anthony8858]

I want the most in flexability.
I have LPS, and intend to venture into SPS.

I want a controller, and 2 PH's

 

[rvitko]

I would start with one 6000 and a controller- get a multicontroller. When you go to SPS you can add a second if you like.