I guess it depends on the size of the company, we have some customers with netgear prosafe 24 port web view switches because they are pretty small operations. All of our larger customers use either cisco, 3com or hp switches as they just can't afford the downtime that happens when you use consumer grade equipment.
The deal with running copper between buildings may just strictly be a usa thing, there are a bunch of rules you have to follow to subscribe to the local building code. If we don't follow them we risk the chance of being sue'd if someone's pc gets nuked or the place burns down.
If you were looking at the lower end of the price scale and you couldn't afford fibre, or point to point outdoor units, I would go for 2 linksys wrt routers with dd-wrt firmware in point to point mode.
Dan