Here are some good options:
Lancome Teint Idole Ultra (14 hour wear, Oil free!!) (They have a "fresh wear" version that claims to feel lighter and wear longer but I think the original one covers and looks better. I use this foundation all the time)
Makeup Forever Mat Velvet (Oil free) My sis uses this and loves it. No shine, good for oily skin.
Laura Mercier Silk Creme foundation (Full Coverage, Oil free) This foundation overs amazingly! Laura Mercier also makes an oil free liquid foundation targeted for oily skin that you could also try, but if you're looking for coverage, I think this one is better
Hope that helps to narrow down your search!