I've found veksar to be the best experience up to 60, highborns con dark blue to level 70's. You could also try WoS, but I don't know how good that would work they hit really hard. If you have the cleric, sk, and mage on different accounts then do this. Load up the cleric, sk, and mage and bring them all to WoS. Then group the mage with the SK and just leave your mage AFK while the SK rips through mobs with the cleric healing outside of group.
I used to bring my druid when he was level 50 to WoS and have a guildie rip through mobs while I healed him and experience was insane, with double xp I got 1 orange for 4 kills which is just nasty at level 50.
Goodluck.