I recommend you look at something like a Netgear WNCE3001 rather than ethernet repeaters. Turns any ethernet port into a wifi connection. I have one on a media player in my living room.

Cheap, fast, easy to set up, USB powered, supports 5GHz, and for me it's been totally problem free. Software won't ever get in the way because as far as MorphOS/Mac Mini is concerned, it's connection to an ethernet hub.