I have seen a few of my favorites mentioned already (Amy Reid, Nina Mercedes, Erica Campbell, Aria Giovanni, etc), but I am surprised that nobody has mentioned Raylene.
I prefer real, although tastefully done fakes are ok at times. B-C are alright depending on the girl's frame, but D-E are usually better (proportion is important).
Quality over quantity though. I like perky, smooth, round ones with smaller, light colored areolas. No basketballs glued to the chest, crazy veins, 8" areolas, or war & peace written in braille.