I've got waaaay too many favorites. But lets see if I can name some off the top of my head:
Kurumi Morishita- Freakin' love this girl. Probably one of the first AV actresses I truly loved. She can certainly swallow!
Asuka Sawaguchi- People criticize her for being too bushy, but how can you pass on that cute, innocent face!? I think she gave some of the best BJ's in the business. It's too bad she retired. =/
Moe Oishi- Takahashi Ai look-alike! Orgasms every 2 minutes. This girl is so fragile. ^.^
Sasa Handa- A very cute gravure model who recently went to AV
too lazy to write up descriptions, so I'll leave you with a few more: Mari Fujisawa, Rei Anami, Sora Aoi, Yua Aida, Mihiro, Kaede Matsushima, etc etc