The best 802.11 units for the money I found are the Senao NL-2611CB3 radios. They run 200mw and there is also a 400mw version. Also the receivers in these units are better than most low end radios. I have a 2.5 mile non line of site path working with these units for two years now with no trouble.
Mine came from Pasadena Networks: http://www.wlanparts.com/product/NL-2611CB3 I have no association with Pasadena Networks other than being a satisfied customer. Dex, W4DEX
