Yoko Hikasa - Rias dude. don't forget Jeanne in Nobunaga the fool and Amakusa Shino. plus Sachika Misawa - Kuroyukihime <3 and Rie Kugumiya for the tsunderes!
Touyama Nao (she did well as Nakagawa Kanon, Yuigahama Yui and of course Kirisaki Chitoge! ) Hanazawa Kana (i think she is everybody's favorite) Iguchi Yuka (with her platinum voice <3) Satou Satomi (i love her when she (as Chitanda) said"watashi kininarimasu!", and then i just knew she voiced the tomboyish Ritsu. oh oh also Nana-Senpai from Golden Time!! She is so Rock!!)
and many more...... i don't know any male VA but i like TK in angel beats haha
sakurai takahiro (he just did some really great roles) tanaka rie saito chiwa shintani mayumi miyamura yuko namikawa daisuke (he also did some great roles)
i never really bother with voice actors, anyway, so i don't remember many.
Yui Horie. Period. She can sing, she can voice anything from a cat to a delusional witch-obsessed girl to your typical yet not so typical number 1 member of the Harem. Although I don't quite understand why Kugimiya Rie is known as the Queen of Tsunderes when Yui Horie has voiced just as many tsunderes.. Plus you couldn't call Happy and Kagura tsunderes, right? :3