Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
This one seems good: https://www.amazon.com/D-Link-EasySmart-24-Port-Gigabit-DGS-1100-24P/dp/B00P7RAIZS/ref=sr_1_2?s=electronics&ie=UTF8&qid=1513147383&sr=1-2&keywords=DGS-1100-24P
I recommend Cat6, it is cheaper and definitely enough for your bandwidth requirement now. Also, you can run conduit, so that you can replace the cable easily.
I find a 2 fibers single-mode LSZH outdoor cable, which is $0.37 for 3 foot (2000ft is around $230. The cable is completed with the LSZH material jacket, which has good flame retardant performance. Besides, you can also custom the length of the cables for your needs. It may be suitable choice...
As many people have said above, you need to set multiple APs, at least one story one AP. Also, I recommend PoE, one Ethernet cable for both power and data transmission, that will simply your cabling.