Thanks, again, everyone.
Goodness, Mike - no wonder you got carpal tunnel! That's quite the project you had there! Fortunately, mine is nowhere near as complicated! I'll make sure to check out your thread.
So I spent quite a bit of time up in the attic checking everything out. The switch for the light in the room is in a 2-gang box (two switches - one for the light, and the other for a ceiling fan). I was thinking that tapping into the source line for this switch might be a cleaner way to go, somewhat in line with what jp1979 suggested, except I'm tapping into a switch as opposed to an outlet.
Doing the above would avoid junction boxes altogether, but now a couple more questions:
1. Is there anything wrong with doing this, i.e., tapping into the source line of a light switch? I would drop molex down the wall into the 2-gang box and tap in right there.
2. What's the maximum number of wires I can hold in this 2-gang box? The box is 3" deep. It currently has 3 molex going into it right now (source, light, and ceiling fan), and I would like to add a 4th one (pj power).