Searching for an outside security camera

I want to build a security system, but I am having trouble finding the right hardware.  I plan on using Motion to only record video when there is movement outside.  I prefer an IP-based camera instead of using a capture card.  Capture cards limit the number of cameras that you can use.  With IP-cameras, I can buy my cameras over time and add them to the system (who can afford buying them all at once).

Most of the home cameras that I have seen use an AC to DC adapter.  If I mount the camera under the overhand of my roof, then I need to put power somewhere.  Normally, you would run power inside of the attic, similar to an outdoor light.  If you do that with one of these cameras, then you are putting the AC to DC adapter inside the attic.  Attics are hot.  When AC to DC adapters get too hot, they tend to explode.  Explosions are bad for houses.  This means I would have to put outlets under the overhangs next to each camera.  Each of those outlets would be GFI's as well.  Nothing screams professional like having a big AC to DC adapter plugged next to your camera.