We found EnGenius' ENH500 an inexpensive way to take your network where wires can't go.
NETGEAR's WNCE4004 N900 Video and Gaming Adapter has its good points. But 5 GHz performance isn't among them.
The Ubiquiti's UAP-LR is a decent, inexpensive access point. But only partially lives up to its "Long Range" moniker.
Updated - The Buffalo WZR-300HP runs on DD-WRT out of the box. But don't expect miracles from its "high power" branding.
Under $50 for a simultaneous dual-band "N600" router seems too good to be true. And in the case of the TP-LINK TL-TL-WDR3500 it may be.