I went to my local box store earlier this week to stock up on 60W bulbs for the next couple years. I don't plan on keeping a lifetime supply, but I'd like to have enough that the LED's can come down in price to something more comparable to the range incandescent (standard or halogen) currently sit at. The price of the LED's has come way down already ($50ea to ~$15ea), but it's still pretty pricey compared to $1.47 for 4.
When I was looking at the options, I found that the high efficiency incandescent bulbs have come WAY down in price too. Last time I looked, these glorified halogen bulbs were priced at ~$10ea. This was at the same time that LED's were running $50, so it was a much better price, but for some reason they didn't take. At that time, they were rare in my local stores, so perhaps that's part of it. Anyway, this time they had those same bulbs in a 4 pack from all 3 major manufacturers for ~$6 for 4.
From the looks of it, we may not be forced to use CFL or LED bulbs afterall. As I understand, these are basically a halogen bulb installed inside a standard A type bulb. These should work perfectly in all X10 applications without any modifications. They are 28% more efficient, so they meet the gov't requirements and should be around for the foreseeable future. When I burn through my supply of standard bulbs, I'll be using these ones!