36-44 sungsungs , yes sometimes you will die because of giants. but dont worry. at all your getting easily exp+. at 42 you should also kill them.
44 - 50 bungwangs, same problem at giants. first go to small bungwangs, they dont have giants. (or go maongs until ~ lv 47)
50- 56 ishades/hashades (maybe until lv 50 to white spider etc)
56 - 64 sonars, they arent aggro, and dont have any giants (you can also go penon warrior, with noise they dont attack you so its safe)
64 - 68 yeti maybe (there are spots with non aggro yetis only, so safe without giants) , otherwise go edimmu or still sonars
68+ non aggro sniper (dont attack pt mobs, there is a lot of plvl, good spot near oasis in taklamakan)
later on i still dont know, didnt lvled a wiz/bard higher than this. Mine ist acutally on 74, near 75, im still at sniper.
edit: Dont forget just to use ice and fire bolt (at lv 60 take Frozen Spear). You need to 1hit normal mobs. Dont use aoe, you will aggro too much mobs. And these skills dont need much mana, you will save money.