Virtues aren't really worth it to level intentionally as you're going because you'll use different virtues at cap anyway. While leveling, Might, morale, or physical mitigation virtues are the best. When you hit cap, that changes to tactical mitigation, which means for the most part the effort you used on those other virtues is wasted. Like El said, Zeal is a great one. Innocence is also a good choice for both leveling and cap. Other than that, don't worry about 'em. Just pick the three highest virtues that're also relevant to what you need. (So basically, don't pick Wisdom.)