Not new but a question about champs
 

Who should I buy..

Garen:
Singed:
Nidalee:
Shaco:

P.S I'm buying them on my 30, I've used them all

Singed or garen or nidalee,
They are great team players aside from shaco

? Shaco is a fantastic jungler/counterjungler, great at ganking, and dragons/barons very quickly with wriggles and bloodrazor.

Garen has been terribly nerfed, at least wait to see if they make him viable before buying him.

I'd go with singed or shaco myself, nidalee doesn't fit too well in current metagame. A good champion, but not one i'd get before those two..

Garen was overnerfed IMO, the breakeven point for his E to do the old damage is 295 damage. It's nutty. I expect some love to him soon.

Shaco is one of the strongest gankers in the game, high jungle power+stealth+high mobility = OMG

Singed is a great team player.and always a nightmare to play against.

Nidalee I think is to squishy to the current encarnation of the game, the tanky DPS metagame was hit hard in the last few patches, but you sill will encounter 3 tanks 1 beefy 1 squishy enemy team comps. Nidalee is situational (natural hard to handle), but played right (very good) is not situational and a force to be reckoned wit.