I researched over 1000 IP cameras.. and bought some 3megapixel 1080p 1200p IP Security cameras.. for $120, see my posts and pics on this forum:
Those are similar to the new Ubiquiti cameras.
Need to be careful when weighing your options.
Those are fixed focus cameras.
Wifi will probably need it's own network if you have more than a couple of cameras, and the frame rates are low.
You'll need a NVR or computer running to view and capture the video streams too.
I don't see a link on the site to the super detailed spec sheets for those cameras.
The more features you put on a camera, the more the price rises (obviously).
But you gain a lot of flexibility.
Pulling processing off of the network will save a lot of bandwidth.
For instance, the Vivoteks i talked about do motion detection and e-mail at the camera itself. If it detects motion it will send e-mail with text, vids or snap shots directly from the camera, no NVR or software needed.
Multi-streams allow you to view a low res image, which is fast on something like a 5.7e touch screen, while simultaneously recording a full resolution stream to disk.
You can also use multiple streams from a high res camera as separate camears, focusing their view windows on different portions of the overall camera frame.
Recording is essential to security.
Weather perfomance is something to think about too.
How cold does it get where you live?
Is it humid?
Either one and you'll need fans and heaters, or a sealed housing with dessicant inside.
Think of your CCTV system holistically.