Check out Hikvision's PanoView line. They make cameras with multi image sensors plus a PTZ in the center so you can get 180 or 360 degree view plus the PTZ functionality
Use a different port number I personally never use the default ports those will be first ones scans for people looking to hack Hikvision devices you can pretty much use whatever port number you want within the normal Port range of router
B&J photo. Maybe not the cheapest but they are reputable and you'll still have full warranty some Distributors will allow you to open an account without having an alarm installers license that would be your best bet this way at least you pay wholesale