Best class combinations to dualbox.

[Conquistador]

Hi, I´ve activated my second account for WoW with RAF, so that I can level alot faster since I want to have alts of all classes on my two accounts. I have been looking a bit on the forums and searched with google to see wich classes are the best to dualbox with. Also keep in mind that that I don´t have another account to boost myself through the instances sadly enough.

I want to level the following classes to 80 as easy as possible:
Warrior
Rogue
Hunter
Mage
Shaman
Deathknight
Priest
Warlock
Paladin
Druid

Now I have also seen that the best combinations for this is to have two ranged classes, like for example:
Shaman - Shaman
Warlock - Warlock
Mage - Mage
etc.

Even a combination of those would do great, now my following question is:
If I want to level a warrior should I go for a combination with a ranged class, the same class or is it better to take another melee class. I personally was thinking about a melee - ranged combo for all the classes all the time. But as I read more and more it seemed that this just isn´t the way to go if you want to level smoothly. Any help and suggestions about dual combo´s would be very appreciated. I have read about the macro´s and addons that you generally use, so making a macro wouldn´t be any problem. Thanks in advance.