L'Essentiel Natural Glow Foundation (SPF 20) by Guerlain. is good (a little goes a long way). I can put a moisturiser on under and not have to wait before application.
Also, Bare Essentials Complexion Rescue Hydrating Foundation stick (SPF 25) which is what I'm wearing today. You cannot layer and build-up though. Put on as much (or little) as you need and just blend-out gently, that's it. It's quite nice for Summer as it goes on cool and then stays put. I have to say it's good for me too because they have a good colour match (and as I have problems matching due to undertone - everything too yellow or too pink).
You could also use Nars TM (which you can build-up - SPF 30) . No patchiness, no oxidisation, very easy. It's good in the Summer and powder would look odd anyway (if you use it).