Even though I don't like all the changes, I'm still looking forward to playing WHM, SCH and AST. Especially WHM and SCH.
I'm also looking forward to the new SMN. Right now I'm not really a fan of it, but the changes look nice and change the things that I don't like about SMN. Now if they didn't have books as weapons...
MCH looks nice with the new stuff, but I liked having the turret out all the time and also the reloads. I won't play it much anyway, but if I play a ranged DPS then maybe MCH first. I'll also try out DNC though to see how it will be.
Until now my favorite tank was DRK (despite Dark Arts spam). But I do not like the lvl 80 ability at all, it's so cringe-worthy. Fray was cool, yes, but having him appear in battle and fighting with you is so weird. I don't want to summon a person (or shadow of it or whatever). Maybe I'll try out PLD as my first tank. I don't like having a shield and I much prefer the DRK animations, but the new spells look kind of nice. Or I'll try out GNB. WAR is nice too, but the animations don't fit my character so well.