OT - Outdoor 'short range' wireless Equipment

Just wondering if someone can recommend a solid wireless setup for
connecting 3 Buildings.

Looking for ideas on what hardware I should be using to keep things secure,
yet fast... And perhaps on a low budget.

Buildings are all within 1/2 to 1mile of each other and if labeled buildings
A B C the Highspeed internet is at building A, and building B already has a
60' tower both building A and C can see the top of the tower.

My thoughts are:

A) Get something working with the Linksys WR54G with a custom bin and high
gain antenna and sheilded cable...

B) Bite the bullet and go with Motorola Canopy hardware... $$$

C) Buy some offshore highpower outdoor hardware (e.g. Ovislink) setup and
outdoor bridge.

D) Some other idea.


Thanks

---Andrew