So far, I found the Hawking Technology Model HWU54D to be the best. I saw it reviewed on CNET, I believe, and they said it was the most powerful because of its built-in 6dbi antenna construction. You can also config it to be an AP.
The only draw back is that its antenna is unidirectional, which some people may not like.
I also had a DLINK DWL-120e which uses that Start Trek communicator design. Even though its only 802.11b, it had great range. The newer DWL-G120 adapter is 802.11g, but its got mediocre range.
Any others with great range?