600 tvl should be a good camera. Mine is a sony 540tvl and i cant fault it.
As for the package with the four cameras, it seem to me good value. but be aware that the quality I had with an Avtech h264 dvr is ok but far from ideal.
The PTZ camera is handy if you need that option. A single PTZ can only see one area at a time but can be set to automatically scan a wider area than four cameras will be able to cover. Some PTZ's also have inputs which can be connected to PIR movement sensors so the camera can be programmed to move to a preset position if someone triggers the PIR sensor. Advantage with a PTZ is that it can zoom in to a specific area although some fixed cameras can also be zoomed, but once set they are fixed until you manually adjust them again.
The PTZ will also need something to record to, which means adding a dvr so will be more expensive. Also be aware that some dvr's have a problem controlling ptz cameras. I only found this out after I purchased mine. It is advertised as having PTZ control, but in reality there are some incompatability problems so get some guarantees with the seller before purchasing. But you can program the PTZ camera with a joystick (more cost) or use software to do the job. I wrote my own program to do it and you are welcome to a copy if you do go down the PTZ route.
If the four camera package will do the job then I would probably go with that because its cheaper and easier to set up. If you need to scan a wider area and zoom in then the PTZ is the best choice. Be aware that the cctv dvr in the four camera package may give you disappointing results with video quality playback.
Choosing the right package can be a bit of a nightmare because there are so many options and different quality of systems, and there is the cost to consider. Can you get a demo from the guy that came out? At least with that you can see the quality before you buy.
IP cameras may end up being the easiest option if you can get the right quality of recording. Dont know how desperate you are for this. I would advise you to take your time and get it right.
You are probably more confused now than when you started. (">
Check out this guide on IP vs Analogue cctv:
http://www.aventuracctv.com/analog_vs_ip/
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