So, what, faster than the 1.5 second recast that the Enchanted form specifically reduces it too?
If you're assuming the regular and Enchanted variants are the same, don't. Look at your tooltips for each.
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On topic:
Red Mage, Ninja, and Monk are probably your easiest DPS, in that order. Bard is also very simple, but cluttered and less intuitive to master (similar to Monk in that regard).
Funny... Mine is higher level than yours. But, okay. I'll stick to my other 70s.
The confusion was due to the wording. I use the half-cost imbalance frequently. I assumed you meant the rate of the combo itself, not the rate at which one gains sufficient mana to perform it.