John,

My apologies if I didn't mention the non-standard POE on the Unifi when you asked me about the product. The non-standard part of it doesn't have anything to do with the ethernet cables, though, just with the source of the power. I believe the Unifi products use 24V instead of the standard 48V (but I'm not very read up on POE stuff). Ubiquiti sells POE switches, so if you wanted to replace the last switch in your setup you could do that.

For such a long run, the alternative would probably be fiber, but then you'd have fiber adapters at either end, leaving you with about the same amount of equipment as you had before. I'd say if your current configuration is working for you, then leave it alone.