Like much things in life it depends a lot on the style of playing you like.For me no Cannoneer or Buccaneer. They bore me (but thats just me). Ark and Cadene have good DPS en lots of mobility, which makes them fun to play (again, for me)
Blaster's the highest of those classes on the DPM Chart, though Cadena will pass it around December or January. DPM charts aren't all that reliable though and it'll mostly come down to what class you like playing the most, since you'll want to fund that one more.
I personally prefer Cannoneer out of all of those.
It'll always stay at or near the top, because the price for playing that class is carpel tunnel since it makes Aran and Battle Mage feel like Wind Archer.