I am not a camera person and can't speak to "Bang for the Buck" but I approached my camera decision the same way I approach most HA research... make a list of requirements and see what meets them within the budget I have allotted for the project.
My Budget for my camera project was $2,500
My requirements were:
1- Be able to view real-time video from the front door, back door, garage and driveway from my desk, the kitchen, the bedroom, and the basement lab (with options to expand to more locations easliy. This would require 4 pan/tilt cameras or 8 fixed cameras (I had no preference).
2- Cameras must be outdoor rated to minus 20 farenheit and be resistant to UV, rain, snow, etc.
3- Cameras must include audio.
4- Cameras must be color and work well in low light conditions.
5- Cameras must stream audio and video over my existing LAN. (I was willing to run wires to the camera locations but not to all of the viewing locations.)
Nice To Have features (not required) were:
1- Ability to add recording at some point in the future.
2- Ability to access cameras remotely over the internet at some point in the future.
Research Results:
Cameras requiring separate weather housings quickly exceeded my budget.
Most options for using 8 fixed cameras exceeded my budget.
Many popular solutions did not meet the audio requirement.
Solution:
Picked 4 Panasonic BBC-HCM331A cameras. Street price is approx. $460 each for a total of $1,840. These are IP, PTZ, do not require separate weather housing, include audio, and are rated for the required operating temperatures. They also enjoy wide support by makers of camera DVR apps.
Installed 2 BB-WV10A camera servers. 1 feeds the house video through a modulator. The second is local to the kitchen providing an easy to use IR remote to operate the Pan/Tilt/Zoom. Cost was approx. $250 each for new units (required agreesive shopping as prices are all over the place on this item). Total $500
The cameras stream directly to browser sessions on the music server in my office, a laptop in my bedroom, and a PC in the basement lab, so cost for those locations was $0.
Total project cost $2,340