I'm sure 1 cup a day is fine. I too am a heavy coffee drinker and I don't think one cup a day will hurt, but decided to let it go for myself & the baby as I know that the benefits outweigh the other.
What about decaf? I made the switch and haven't really noticed a difference taste wise. :)
I'm sure one cup of coffee is fine. It's only if you have heaps during the day :)