The very best healer in the 10-19 bracket is your hands down. Priests are the perfect balance of defensive and offensive capability. They have access to the largest range of wow gold of healing spells in the bottom level. On the Alliance side, dwarves and humans have Desperate Prayer, an instant zero-mana spell for dire situations. Additionally, their 3 Power Word.
Horde priests are perhaps even better, as the troll racial Hex of Weakness could be catastrophic on flag-carriers by reducing healing by 20%. If their spells were not amazing enough, priests access this Gravestone Scepter at par 18. The wand does a 29 DPS more than any other wand acquirable at the level. The damage output can be immense combined with Shadow Word: Pain if the priest is specced to Wand Specialization too.
Paladins are not flexible. Having a one-handed weapon along with the Arctic Buckler in the Blackfathom Depths pursuit, they are sometimes tanky. This combined with Improved Devotion Aura offering 25% extra armor into the already 160 additional armor and Blessing of Freedom means that they're taking little damage from melee strikes and may run to security unimpeded.
Can't be matched. Plus, since weapons can be switched in battle, the paladin can swap from a tank. There's a good deal of potential in weapon swapping here if you have the money to get everything. Paladins are most often healers, but it doesn't mean that they can't do sick damage if fortune is in their favor.
Shamans, particularly augmentation shamans, hit on a power spike that was huge of cheap wow gold classic in the 49 bracket. Elemental Shamans are always excellent at the 39 bracket, but for people who favor the melee style level, 49 is where the fun starts. No additional melee can hold a candle to an enhancement shaman's power. Granted, a lot of their power comes from RNG components: Wind Fury proccing crusader proccing. When the tides are in your favor, shamans may take an enemy health bar down to near-zero inside a global. They're bursty and gratifying.