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For the price, around 50 bucks or cheaper, you cant beat the nanostation m2s with a bat.
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Where are you finding NSM2's for $50 or cheaper? Best price I found recently was $77 each with shipping on top of that.
For the OP, as others have stated, Ubiquiti Network products makes this super simple. Nanostations are a good choice. When 2 nanostations are connected to each other in bridge mode (Point-to-point wireless bridge) they act just like a LAN/Cat5 cable stretched between whatever they are plugged into. IE, DSL modem connected to your Bridge Access Point @ the neighbors house and your wireless router connected the Bridge Station at your house.
~$80 each for the 2 nanostations, ~$10-20 for the special shielded & grounded CAT5 cables (Ubiquiti warranty is void if you don't use the grounded cables), and you're done...
The Ubiquiti products are actually top-notch. Lots of pro features at a home-user type price-point. IE, they have a built-in spectrum analyzer, not only can you analyze the wireless spectrum where you are, but you can then specify a specific channel (in order to use a less-congested area of the spectrum), then change your channel width to increase power spectral density (more distance/punch through obstacles) at the cost of speed, or more speed at the cost of less ability to punch through obstacles. Not many products at that price point give you those options.
As far as which nanostations there are several options and it depends on your setup. Loco M9, 900 Mhz pierces trees and other LOS obstacles better but shorter range on the Locos, M5, 5Ghz for better speed but less able to punch through trees etc, or M2, 2.4 Ghz for a compromise between the previous 2, but the 2.4 band is more likely to be congested leading to performance issues.