After a few months experimentation, I finally fired up 4 RAF accounts about two weeks ago. My first team to 60 was 5xBoomkins (only took two weekends!!!) I didn't start using tourguide until about lvl 30 or so, but it made a huge difference. I found that if 5xStarfire didn't kill a certain level mob, then 10xWrath usually did the trick. Insect Swarm is surprisingly mana efficient, and will kill anything your level if you care to wait that long. I didn't worry about trying to keep them all in leather, just took the quest rewards that gave the best int, stam, or spellpower. I didn't replace my lvl 2 staff until the mid-50s. Mana was never a problem, except in the short time I spent in an instance at a low level. Never drank. Average with RAF is 4-5 quests per level, which stayed the same from lvl 1 all the way up to 60. This was insanely easy with RAF. Without RAF, which may be your choice since you've already got a lot of accounts, the only difference would be time.