It may score low in the performance department but the dLAN 500 WiFi Network Kit by devolo is a very good choice overall.
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Devolo dLAN 500 WiFi Starter Kit - networking cards (White, Wired/Wireless, 802.11b, 802.11g, 802.11n, 10/100BaseT(X), PowerPlug, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, IEEE 802.1p, IEEE 802.3, IEEE 802.3u, IEEE 802.3x): : Computers