I confess. If it's not already apparent in my novelistic attempts, I am a Paige fan. As the youngest (half)sister, Paige brought a quirky vibrancy into the Charmed Ones. Her tentativeness in Season 4 gave way to a witch on the move in Season 5. The more appropriate hair color (red) helped immensely (of course). I am a PAIGE-HEAD!
Paige is the one who is most capable of rattling cages. She is the one who doesn't merely accept that some things are inevitable. True, she sometimes gets dispirited (Something Wicca), but she wants to do specific acts of good. Hence, she was the most skeptical about the Avatar thing. It was too global an act to help specific individuals, too utopian for her.
This explains why she grew so strongly attracted to Henry. Here was a down to earth guy making a contribution to improving the lives of people caught in an awful vice. What cemented her attraction was the episode when Henry begged her to take in the parolee's baby. That's what Paige did with Tyler and how she bent over backward to protect Caroline. Two peas in a pod. None of her other boyfriends even came close. Agent Brody was a possible mate, but too self-absorbed over the loss of his parents. Henry had lost his, but moved on.