30-40

Well at level 30 I could only find 2 quests that were yellow for me in STV except for one green quest in BB, at level 31-32 that changes and there are tons of quests that are yellow, and there are 3 quests where you have to collect things from the same mobs, the trolls, so basically you do 3 quests at once which is very efficient, and they are just north of Grom'Gol, so even if an alliance attempts to gank you you can run away if you can't handle them, I guess it depends partly on what class you are since as a mage I can run away from just about anything. The only thing that killed me in STV was a 60 rogue that ambush critted me for 1500 damage or so, and I barely have 1000 hp.