I am running a long run (approx. 250-275' to a switch and then another 250-275' to another switch) Each end switch will be connected to a computer. I would like to know which type of cables I should use. The wire will be sealed inside PVC pipe and buried. The total run will be approx. 500' with a switch in the middle because I was told that I needed one. I am confused about the solid, stranded, Plenum Cat5, Cat5e, Cat6. Any help would be greatly appreciated. Thanks.