ATK used to be one of the very best sites and they still have some great sets on their sites. Now though they seem to mix things across all sites in a way they never did before. You get hairy pussy on any site sometimes even though there is a special site for that. They publish hardcore on any site even though they have a special site for that and so on. That means we end up with a lot less of what were paying for in the first place.
What I would recomend depends on what you are after but I still think Nublies do very nice work with somewhat a little softer touch. If you want a little more focus on open pussy I think you should go for In the Crack or FTV Girls. However you should know that they don´t publish nearly as many updates as ATK. If you want REALLY rough pussy spreading/gaping, definately SPAM! That´s were I am at for the moment and I´m happy with it for sure :)
I would stay away from Karups. They used to be great but they lost me way back.
Hope that helped
Edit: "SPAM!" ?? There wasn´t even a link, how can it be spam?? And why isn´t the other site names "SPAM!"??
Edit: A week ago we got nine hardcore sets on one day. Last saturday we didn´t get any sets at all and todays update is nine sets with the same girl who is like eight months pregnant!! I don´t know where this came from but aiming for micro niches like preggo and pissing games on a site that used to be one of the very best sites for solo pussy close ups only months ago, is totally incredible! I personally can´t think of many things that are such turn offs as pregnant women. JESUS!
Edit: Some more great new ATK sets for you
http://www.amkingdom.com/tour/photo/329581/Paulina-Has-Got-Quite-the-Pair-of-Knockers
http://21sextury.com/scene/71111/CutiesGalore+presents+Ava Cutiesgalore 2010
http://www.amkingdom.com/tour/photo/329350/Kitty-Gets-Her-Tight-Ass-Pounded
http://www.rendis.net/tgp/010711-1602/analteenangelspics01/gallery01.htm Analteenangels 2011
http://www.amkingdom.com/tour/photo/329557/Kaela-Marie-Spreads-Open-Her-Nice-Pink-Fuckhole
http://www.cutiesgalorehd.com/free/fern-cutiesgalore-presents-fern/ Cutiesgalore 2009
http://www.amkingdom.com/tour/photo/327661/Candy-Sweet-is-Sexy-in-a-Pink-Dress-and-Tall-White-Socks
http://www.amkingdom.com/tour/photo/327662/Candy-is-Slender-and-Fuckable
http://www.amkingdom.com/tour/photo/327663/Candy-Sweet-is-Beautiful-in-Pink
http://tour.teendreams.com/cms/model/modelviewt2/i=7362 Teendreams 2014
http://www.atkpremium.com/tour/photo/329372/Yana-is-a-Young-Beauty-with-a-Skinny-Fuckable-Body
http://hosted.21sextury.com/71165temp1/index.html/?rsl=19721 Cutiesgalore 2011