Ok, so Ikve been thinking about this some more and I would definately like to increase my team to 3. At this stage I am thinking of either a ret paladin or mage.

Now for a RAF conundrum however:

I will be using my paladin to do the boosting, so I guess I will not RAF from that account.
On my priest account I also have a level 28 paladin decked in heirlooms, which seems ideal to RAF from.

Can I do the following:
RAF from my priest account and create an account with the exact same details.
Then create a mage on the new account and druid on the existing account which I then boost with my existing level 80 paladin to 60.
And then after all this grant my level 28 paladin the 30 levels from the mage?

If this is possible I would then most likely work the paladin and mage through to 80 together and tranfer the paladin to the mages account, after which I would work the druid to 80. In the end I would have my 3 accounts: 1 with a pure tank, 1 with my priest and druid and the last with a mage and paladin. So I could go for different setups as required.