Honestly, the wireless ip camera seems the simplest solution. I looked at the foscams as an option, but I have concerns about quality from them. Everything in one package and easy to move from spot to spot. Everything will need to be mounted outdoors.
My next thought would be to get a wired bullet camera without poe. Get a weatherproof enclosure and mount it next to the camera. This would keep all the connections out of the weather and also house the wireless router. Still would have to run the extension cord for power which is not a problem.