I will go with paladin.
Depends if it is arena or zone..
probably would go for healer first so defender/troller than blaster, but again experience proved sometimes it is easier to get kills on arena farming the dmg dealer and not the healer.....
tanker/scrapper/kheld as last, too troublesome to kill w/o debuffs..
was just wondering if there was one hero from every AT what one would u attack? I would think blaster or defender maybe even troller but was just curious so what one?