I just ordered this one, the reviews have been positive:

http://www.data-alliance.net/servlet...802.11n/Detail

Plus a 7 dBi magnetic base external antenna.

It's a lot cheaper than that RadioLabs one, for the same power (500 mw). Comparing receiver sensitivity ratings between the two, the RadioLabs one is better. But for 1/3 the price, I'll give it a shot!