I have a Foscam pan/tilt/swivel camera I use for a baby monitor. I like it a lot, never had any issues with wifi, even though the router is fairly far away. Night vision is great, day time clarity could be slightly better, but good enough for what I use it for.
I use tinycam monitor on my phone to watch it, which works nice.
My only issue with the Foscam, is that it uses an old Netscape protocol, and all the browsers have dropped support for it and Foscam refuses to update their plugins.
One thing I like about the Foscam is all you need to view is the IP address, a lot of companies make you use their cloud service. I have mine setup so it had no access to the internet through the router.
You can also setup motion alerts, etc.