I would say Calcium needs to go up before you add coral.
I read an article not too long ago on how Alkalinity goes up or down much more easily than Calcium levels.
If it's really that super low it may take a lot to get it back up.
The big water changes Alton suggested should help.
I just plugged your number into the reef calculator:
http://reef.diesyst.com/flashcalc/flashcalc.html
Not surprisingly it does look like you will need quite a bit to get the calcium back to normal (and then adjust alk to match it)
I'd probably go for a really big water change or two.
If it's that depleted of calcium it may very well lack other things that you are not testing as well.
http://www.reefkeeping.com/issues/20...ture/index.php

Hope I didn't offend you by posting all these links. Clearly you've been doing saltwater a long time and have access to the internet too lol but the calculator and the Randy-Holmes-Farley pages are some of my favorites so I wanted to post them in case you don't have them bookmarked or haven't see them.

What TDS reading does your RO have?