This may sound like an advertisement, but the girls over at x-art.com are unbelievable. Was well worth a month's subscription. (Hope this post isn't against the rules in any way)
Checkout the last vid in this series. It looks like she's about to yack at the end. Very funny.
http://galleries.thirdmovies.com/chicks-and-salsa-2_3/6,714,0.html