Cat 5 or 6 question for outdoors

[tuqqer]

My original post was misleading: the wireless distance between the 2 buildings is a half mile. No cable needed there. I only need the cable to run from the roof of each building down to their perspective routers. This will vary between 40' and about 90'. Some of the wire then will be exposed to the sun.

I'm thinking I'll go with the Cat 6. It's not that more expensive. I'll look around for a box of 500' or 1000'.