As you list Opus Dei among your attractions, it must be safe to assume that you like the idea of working extensively with laity. This being the case, the order of friars preachers would be best for you. They are very sound in theology; indeed, they have often been at the forefront of clarifying the Church’s teachings on many things. Solidity and truth are the bywords of the Order! A traditional symbol of the Order is a small hound carrying a fiery torch in its mouth: a zealous, loyal companion of Christ bringing His light to the world.
If you absolutely must have the Trad. element, the Dominicans retain their nearly-800-year-old liturgical rite. In joining them, you might request to be trained in this Rite, in addition to the Novus Ordo Missae. As a priest, you’d be at liberty to say the Ordinary Form with just as much pious love as you say the Rite.
What matters is not particularly whether Order A, Order B, or Order C is most pious; what matters, in the end, is that you personally wish to give up your life and plunge into Christ. He is the path to the Father, not F.S.S.P., Opus Dei, or the Dominican Order. In the end, it is always about a total, manly abandonment to the king and general of the army of the order of light against chaos and evil.
Were you to become a simple diocesan priest, you still might practice the E.F. and/or the O.F. piously, with the eternal salvation of Christ piercing your heart. Make a religious order in your own heart, with yourself the only member and Jesus Christ the only superior-general; do that first, and then submit yourself to an earthly Order. Grace builds upon nature.