If you think that a Calcium Reactor might be in or future think about doing a full Apex. My wife got the lite for Christmas last year (Yeah, she's pretty incredible). I thought that I was going to stay away from the SPS stuff and stick with zoa's and LPS. Well the SPS bug has bit and I've got a Ca Reactor and having the 2nd pH probe would be nice ( I got lucky and the Reactor came with a controller, and yes I can and will have to pick up the Probe Module ).
I'm sure you have seen this but I'll put it up anyways, its the Unofficial Guide has a good comparison of the different Neptune controllers and a Great DIY section (I think Schwaggs has an article in there). Takes a minute to open
http://reeftech.webs.com">http://reeftech.webs.com</a>
Oh... and it's been said and I will repeat it - Great Customer Service!