Reef tank controller capabilities

[Stones]

I know there are quite a few people on this forum that are currently running some sort of full system controller on their reef tanks. I'm in the market for a controller for my new tank build however I'm looking for one that can control my system's pH by diverting water from the automatic top off through my kalk reactor if my pH is low or by by-passing the kalk reactor and going straight into the sump if the pH is high.

Is anyone out there currently running such a configuration? If not, do you know of a controller that is capable of being programmed in such a way? I'm sure I saw a TOTM on RC that was setup in a similar fashion.

I was leaning towards a Digital Aquatics Reef Keeper Elite but they haven't got back to me regarding this question. I am willing to give another controller a shot though so long as its net capable.

Thanks.