Best cry? Crying is always a sad thing for me so I can't really say that any is the best really..but if I had to say one it would be Kirimi-chan from Ouran..
though my favorite, cute moment for crying is blood plus, right after irene died. saya was with haji and riku, then a tear escaped and she tried to walk away but haji pulled her into a hug link go to to 15:05. :3 if 당신 haven't already watched the series, i suggest 당신 do. oh, and the scene at the end where she cries after the death of someone she loves and cries to haji saying "she wants to live"