I also have neutral undertones (actually, I think I might have a light olive hint as well), and I find that the Natural section of GloMinerals suit me pretty well. At the moment, I'm wearing Natural Medium in the Gloloose base, although I'm a Honey Light in the GloPressed. With Bare Minerals, I mix 50/50 Medium Beige (=neutral) and Medium Tan (=cool).
Most of the time, truly yellow-toned foundations are OTT for me, and make me look sallow and washed out. Yet, cool-toned foundations most of the time appear ashy on my skin.
Apart from the two mentioned brands, I haven't had good luck, but I've made my second order of samples from EDM. I also tried Lumiere, where I at first thought the Light Medium Golden was a good match, but upon second thoughts, I found that too yellow.
