A /PLD sj is like a mini /WHM sj with less spells....its horrible IMO.

/SAM is good at lvl 60 with meditate, but...still why do you want that? Third Eye isnt that great and SAM isnt a hard hitter to give you good stat boosts.

/MNK is good for tanking, Boost generates a decent ammount of hate between vokes, and you get Dodge, Counter, and Focus to hlep your accuracy, not to mention an HP boost. This is a pretty solid choice when tanking.

/THF is good for damage, Sneak crits WSs and later you can Trick onto a real tank. This is pretty soild for dmg.

/NIN is good for tanking somewhat with Utusemi and also for dmging, especially after you get Dual Wield II Haste upgrade later. Dual Wielding Axes make this a solid choice.

I recommend lvling NIN THF AND MNK for differnet situations..../SAM never was that popular imo.