Here is what you have to consider:

1. You need to "baseline" your hashrates on your cards, mining each different Algorithm.
2. Using these baselines (e.g. Scrypt: 3.2MH/sec, X11: 9.2MH/sec, etc.) you then need to calculate against the numbers on the home page.
3. For example:
  - Scrypt: 3.2 MH/sec = 0.0032 GH/sec * 3.2698 BTC/GH/Day = 0.0104 BTC/Day
  - X11: 9.2 MH/sec = 0.0092 GH/sec * 2.3073  BTC/GH/Day = 0.0212 BTC/Day

So at the moment, mining X11 is far more profitable ...

This is why I want the JSON API to retrieve the values and automate the calculations throughout the day.  Then I need to control and relaunch my miner - pretty easy to do - altering the conf file to switch Algorithms based on these calculations.