1. CRC sells samples and also provides a foundation matching service.
2. If you go with the theater makeup, I recommend RCMA as it is very pigmented and absent of many common irritants. Some of the other brands have lanolin and mineral oil in them, and you said you want oil free.
3. Many Sephora stores have started to carry CoverFX foundations and the have a new oil free option, but it's pricy too.
I'm sorry I have no recs, because I am a foundation junkie and I don't LOVE any one. I use MAC Face and Body on the regular. I will say that's one I keep going back to. That's it.