I've been doing research on this topic as well.
The Neptune Apex is what I am leaning towards because of the iPhone capability.
I am(was) seriously considering the Reefkeeper Elite. For less money you get a couple of probes a well. You can also check tank status on the web but from my understanding, not easily through the iPhone . (I think the graphs are in flash).
The modules also seem cheaper with the Reefkeeper compared to the Apex.
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