FWIW there are now incandescent bulbs on the market that meet the efficiency requirements. Philips and Sylvania both have them. They're basically a new halogen bulb that's engineered for efficiency instead of high output or longevity.
The news article I saw on them said they were available for $1.60/each, which isn't horrible, but I can't find them online for anything less than $3.50/each and that's unacceptable to me given the mild efficiency gains and that they're not supposed to last as long as CFLs.