I've always liked Veronica Brazil and Olivia del Rio a lot, unfortunately they both have done way too little G/G, but Nina Mercedez is the whole package anyway, so why bother with all those others.
Outside of the porn world it's Salma Hayek. I've never seen anyone hotter and more beautiful on TV than Salma as Alec Baldwin's love interest on 30Rock. One time in the park she flashed a red dress, that was just too much, and some episodes later she got a black dress on with the hottest cleevage you will ever see. On the other hand, Penelope Cruz or Sofia Vergara aren't too shabby either.