I'm going with Freedom, Responsibility, Integrity, Perseverance, in no particular order. These are vital to keeping the "self" personally involved with the outside world in a constructive manner. Remove any of these, and construction slowly devolves into destruction. If you are not personally responsible, you will take credit while shifting blame, thus slowly losing integrity. If you do not persevere, you will never get anything accomplished; without accomplishments, you cannot have a healthy ego to support your personal responsibility and integrity. Freedom, of course, is essential to support and enable all of the other values. Every single one depends on being free from oppression and fear.
The others, while nice, are a little more optional. Yes, even love; it's nice when you connect with others, but it is not vital to personal happiness unless you are ruled entirely by your emotions. (<-- gross generalization) The point is that without those top four, the others will fall apart, especially success and serenity. Spirituality is a personal choice, so it's not vital to everyone, just those who accept it. Finally, happiness is a function of personal well-being and comfort; you can be happy in miserable circumstances and vice versa, so it's up to the individual to decide where their happiness lies.