What product is comparable to ultima ii wonderwear foundation in buff?

I also have been a big fan of the Ultima II Wonderwear makeup and fortunately when I saw it disappearing off the online sites, I did some bulk purchasing and have a few bottles in my stock. I do agree it is the best for natural appearance with good coverage and super staying power. I've tried a bunch of other foundations at very high prices and the staying power doesn't hold a candle to the Ultima II. I have yet to try it due to my little stock pile, but others that can't find the Ultima, have recommended the Estee Lauder Doublewear which they review as being the closest to the Ultima. The comparable shade in the EL would be Ecru. Good luck.