I NEED HELP DECIDING ONA CHAMPION!!!!
I am looking for a mid champion preferably an assassin, someone who can take down champions quickly, has a good lane phase, and is just, idk, overall GOOD. I have been looking at Zed, and really like him, but I am not sure whether he is worth it since he has LOTS of cons, such as bad late game, bad in team fights, his ulti is easily countered, and a Zhonya's or QSS will destroy his gameplay. So I have two questions.
Who am I looking for, if you don't think Zed?
AND...

she has good assassin type elements while also being AP for damage diversity. she also has a good laning phase as long as you use her mana responsibly and hit your qs and es semi regularly.