Well, I don't know about you guys, but I'll take the power antenna any day. As far as it getting broken, I recommend putting it down before entering a car wash, as well as putting it down at night. Yes, antenna replacement can be expensive, but breakage can be prevented the majority of the time.
Power antennas are my preference for another reason: They seem to be put in more securely than regular antennas. I found that the manual antenna on my truck has a propensity to come loose from wobbling in the wind and bumps in the road. That causes the signal to break up. However, my girlfriend's Toyota power antenna doesn't work itself loose like that. I like a girlfriend that doesn't have an antenna loose somewhere.