Wireless adapter: need a new one

I picked up a Trendnet TEW-424UB usb wireless adapter for my parents'
computer. It has been pretty flaky. The first few days, it
frequently worked for only a few minutes, before needing to be
unplugged and then re-plugged in. Then I stopped using the little usb
extension cord that came with it (which was useful, because the
adapter is large enough to prevent the use of the slot next to it),
and plugged it directly into the usb slot. We didn't have any
problems for a week. Now the last few times we have turned on the
computer, it has not worked unless we unplug it and then replug it in
(and sometimes that doesn't even work). I am going to be returning
this piece of crap.

I see on Dell's web site that you can select a PCI 802.11g wireless
adapter when buying a computer. Anyone know what brand/model that
is? I will assume that if Dell is selling it, then it probably works
for most of their customers.