I have not had any great issues with Wifi on any of the laptops I've installed on... I suspect that the "find a laptop that Ubuntu will work on" is becoming less and less of a factor these days, as not only does wireless hardware become more generic but the OS continues to support more and more.
I'm running Ubuntu perfectly well (with Wireless) on two Currys own-brand laptops (Advent and e-Machines) Sean
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