I use a mixture of Geovision and Vivotek cameras. The Geovisions are GV-VD320 and GV-BL320 dome and bullet respectively. Both are 3mp POE outdoor, IR capable (i also have a 96 led IR blaster for the BL-320 as it looks across my back yard which is around 150 feet long) and provide pretty decent night viewing.
The daytime images are great and provide input/output options as well as motion detection. My only issue with the Geovisions is that they don't have a directly accessible MJPEG stream for access by my HAI OPII panel, so I have to run their mobile server software on my touchscreen which does give an MJPEG stream. Not the end of the world, but adds an extra layer of complexity.
The Vivotek is an 8136 1mp ultra small dome which I use for the front door, it does have a directly accessible MJPEG stream, so the OPII can display it directly.
Here is Australia, the 3mp Geovisions are around $600 with the 1mp versions around $400. Not sure how much they are in the US though, but having just gotten back from a month over there, everything is so much cheaper!