Tough one ... Kira Kener (mainstream), Maria Moore (favorite)
This is a tough one.
If I had to pick a mainstream pornstar, Kira Kener gets the call. And she'd be near the top in action too. I'm not into facials, and she isn't either, and her fuller (although still somewhat thin), hourglass curve riding atop of manhood is pretty, fucking unbelievable in my eyes. Her "role playing" is tops too. I can't watch many of her vids or I'll toss it -- yes -- ProfV actually loses it over a thinner woman like Kira.
If I had to pick a mainstream blond (normally not my thing), I have to agree with one other poster, why hasn't anyone picked Brittany Andrews? She's definitely a head-to-toe "Barbie" (and I spent a good month unloading to a few of her videos when I first discovered her). Also had a major thing in my earlier years for Angela Summers and, more recently, Sunrise Adams -- and I loved Angela Summer's ability to "get off" on camera.
Now if we look towards the lesser mainstream, there are dozens of curvy goddesses! Chloe Vevrier has only done 2 (or 3?) H/C scenes, but her overall presence tops my list as she's my all-time favorite "curvy babe" (the action in her H/C was rather tame though). And I think many would pick Brandy Taylor well up there, and she's just looks like a sweetheart. Even shorter, more apple-shaped, and sweeter in my view is Annie Swanson, entirely too under-rated!
I'm also and totally into many of the fuller women in the Natural Wonders of the World series -- from Bozena (aka "Tiffany Treasures" and "Ester") to Constance Devil (aka "Sylvie" and "Bianca Jordan") to "Jessica" (don't know her real name) to more well-known Iva Kloviena (aka "Mandy May") and "Wendy White" (aka "Lara Mountjoy" aka "Marketa"). The first 3 definitely make my heart race pretty damn high with their looks -- head to toe -- even before their bodies start moving.
But in all honesty, I think the woman who has done H/C that really flattens me on my ass -- looks-wise -- is Maria Moore. I love her style. I love her pout. I just love her body. That raven profile and her extreme curves drop me into fantasy just in lingerie, even before she moves.