I've checked out the IP cameras at Challenge Funan. Some thoughts:
Since I intend to reuse the camera for other purpose after baby grows up, I'd rather get an IP camera that is better supported by 3rd party software, can record on my linux storage, etc.
Prolink: more costly. cam viewer software on demo laptop was not working.
Sineoji: Somehow the video was very laggy and the screen tears, even on the local wifi/lan network.
Edimax: seems decent. The 7110 also features motion triggered recording, but I couldn't seem to get it to work. Not sure if this is h/w motion detection, or s/w dependant.
Aztech: blinking lights on the cameras, but couldn't find the demo pc for viewing.
vstarcam: seems decent. Comparison info said that 7838 can only mount on ceiling and uses 4.2mm lens, while 7837 can also mount on wall and uses 3.6mm lens. But I think all 7838 are now supposed to use 3.6mm lens? The 7838 was also initially very blurry - realised that it was out of focus. Are all ip cameras in this price range manual focus? The f1.4 aperture on these lens means there's a smaller sweet spot with acceptable focus

And, the 7833 is gigantic! Yet it's optical zoom really is just slightly more than 2x.
dlink: more expensive. harder to do side-by-side comparison because the dlink demo wall is far away.
I realised also that I was not able to compare many things that are important to me, including:
- low light performance
- sound/motion triggered recording and alarms
- remote viewing over 3g network
- 1way / 2way audio
- recording on to NAS
Some further questions for you gurus:
- can these things be mounted without drilling holes? Eg, using 3m command strips.
- why can't the vstarcam 7838 be mounted on a wall?
- do any of the above models have h/w motion/sound triggered alarms and recording?
- which models can record to sd and upload to ftp server on my NAS? Or alternatively, which cameras are supported by zoneminder or motion software on my linux NAS? Or... maybe I can fire up an android x86 virtual machine, and run the ip cam viewer software on it.
- do i need to find a camera with external speaker ports in order to have 2-way full duplex audio?
So currently I'm wavering between edimax and vstarcam. and maybe foscam.