If you're worried about enmity (Aggro) generation, just make sure that you're keeping your equipment up to date. Barring Accessories, you shouldn't have equipment that's more than 5 levels below the minimum level for a dungeon (for instance, your equipment should be at least level 10 for Sastasha if you can help it), otherwise you could be really fighting to hold enmity. Be sure to do your class quests, not just for the skills they unlock, but the free weapons every fifth level that come with them will help you here a lot (and don't forget to buy the occasional weapon upgrade past that from your Grand Company or shops if you don't get any drops!)

But yes, VIT all the way.