the A--->B--->C method of RAF invites will work well for you. Remember that C will be granting levels to B toons. There's no way around that aside from moving a toon you want from A to B (which you can do as long as the accts have the same last name) for the bonus levels. It's wise to grant the gift levels to a lvl 30 toon....the run up to 30 is quicker than 30 to 60 and so you take max benefit from the RAF gifted levels.
Here's an excellent guide from boosting. It didn't get a lot of love when posted, but it's been helpful to me in that it's linked to wowhead quests. They are worth doing b/c they give crazy experience for a minimum of running around. My addtional advice is to have your toons stoned to the major cities/different continents and use "summon friend" to move them quickly. That's helped with the travel time.
Here's the guide link: RAF Dual-boxing 'Boosted' Powerleveling Guide for Newbs
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