Hello ,
Here is probably the best site for purchasing what you are wanting to do in regards of a point to point wireless setup.
http://www.wirelessnetworkproducts.com/
I set up an 12 mile link first using Trazeo radios,about 7 years ago,then we went to Ubiquiti radios two years ago with same antennas. With the Ubiquiti radios the throughput was half again better. This was my first endevour of doing this long of a shot,so I am NO expert but the link is very stable after this time. It is a simple bridge setup which is what you are wanting to accomplish(to start out with anyway).
The price has come down sooo much on this good business grade hardware in the last 4-5 years! Your only BIG concern is with that distance you are going to HAVE to have your antennas up on 100' towers. You will have to hopefully be able to find an existing cell phone company to lease a spot on their tower.(This will be realistically impossible),,,:(
Depending on were you are located if you have gran elevators,this is the cats meow. these type of businesses may even let you hang your antennas on one of their gran legs for nothing if it is an old family run business for example.
I would guess for what you are wanting to do,You could buy all of your hardware for $2000 or less to do what you are wanting to accomplish! A simple bridge with one repeater in line
Hope this helps.
Take Care,
Barry