I have the
IKS Aquastar controller 
I love it. At the moment, I'm controlling the lights,
pH, temp, return and closed-loop pumps, and osmolarity.
Here's some details from the website:
THE BASIC SYSTEM IKS AQUASTAR (ART.-NR. 1000) PROVIDES:
connections for up to eight measuring modules in any combination
connections for up to 16 switch sockets (4x4)
availability of sockets with variable output (dimmable)
a readings memory for 2000 chains of readings, buffered by storage battery
a
PC interface for data analysis on the
PC
an update facility via Flash-memory technology
automatic sensor recognition and sensor test
day/night simulation
lunar-phase simulation
high-tide/low-tide simulation
currents simulation
timer functions
interval functions
nocturnal reduction
illuminated LC-display
a real-time clock
acoustic, visual and external alarms
a five-year guarantee
AVAILABLE MEASURING AND REGULATION MODULES:
pH
redox potential
conductivity
temperature
water level
oxygen
air pressure
You can also have an SMS sent to your cell phone if any of the alarms are triggered. I'm quite happy with the system. The only things I don't control on there are my Tunze streams, just because it's easier to use the already designed controller for these pumps. but, even they could be programmed into the IKS system and waves, tides, etc. could be simulated.
