Regardless of the hardware you select insure you run the correct CAT-6 wiring (23 AWG) using pure copper and not CCA (Copper Clad Aluminum). Run several pairs of 16-2 / 18-2 copper wire in parallel in case the PTZ requires more power than you think incase the Ethernet cable can't support it. This also enables you to install 12 VDC accessories like microphone, speaker, or more powerful IR lights whether it be flood vs focused beams for more coverage.
Running a extra pair of CAT-6 cable for a fixed spotter cam dedicated to a primary zone helps tremendously when the PTZ is looking elsewhere.
Anything that will installed outside should use outdoor rated cable because you don't want to running 200 feet cable year from now. Test all of your connections for continuity, resistance, and connectivity. If this PTZ will be mounted on a pole that exceeds six feet use best practices to secure the same to the building structure / ground.
Nothing is worse than to see a video from a PTZ that sways back and forth . . .
As you stated not everyone is made of money but I would encourage you to save up for a unit that falls within the under $850.XX range. It goes without saying review hardware that offers true low light performance that offer large 1/8 ~ 1/2" sensors. If your region see's extreme temperatures make sure you read the specifications as to the operating range for that hardware.
Anyone who has ever installed hardware in AZ, TX, NV, know if the hardware calls out 40'C / 104'F vs 60'C / 140'F. The lower operating range hardware is simply living on borrowed time in those hot zones. The same goes with extreme cold climates where I live and necessitates the need for some units to have internal heaters when the mercury breaks -45'C / -49'F!
More expansive PTZ hardware use metal / hybrid plastics for gears and moving parts. Cheaper PTZ units incorporate more plastic and motors with very low MTBF (Mean Time Between Failure).
That translates to if you have a PTZ moving everyday say ten times per day - A cheaper PTZ will fail just about after the warranty period.
Lastly, anything on a pole including the PTZ camera must be properly grounded to the single point ground in the electrical system. That is coupled with using a UL / cUL approved SPD (Surge Protective Device) at the camera and to the POE / Power supply. Shielded cable is a must for those living in Lightning Alley because once you break 50 feet of cable run you have nothing but a giant antenna just waiting for God to laugh at you and smite you of the power of Thor's hammer!
