Thank you for the responses.
Ok, my overall hope was to stay under $500 or at least close to it. If I have to go over that I guess I will just have to do that.
So assuming you can direct me to an IP camera that will do the job, do I really need to buy anything else? Other than the POE Switch that has been mentioned?
Do I really have to buy something like Blue Iris? As I mentioned I would like to preserve at least a few still images for archival.
The point of the question being, perhaps If I don't need a bunch of other things I could raise the budget on the camera without much overall budget impact.
I do think that PTZ is going to be needed. The first job I need to put it on is only a 3 week duration but is a 12 thousansd SF roof. This project is 225 miles away. there is not really anywhere I can mount the camera that can get a good view of the whole project at one time. Hence the desire to pan etc.
I guess Long story short, this is something I feel i need. If I can't do it for the budget I hoped for, then I will just have to pay what it takes (without going overboard of course)
Thanks again!