/BLU is loads of fun. Quite a strong sub as well for DRG as well.

/WHM isnt really necersary as your wyvern covers you when it comes to healing.

/RDM is handy for buffs / survivability..

My vote is /BLU all the way.. Solo'd more mobs then I even thought I could have dreamed of as a Dragoon. When you hit 90 however, you can solo with /SAM to a certain degree as you can trigger healing breath without a spell.