use the bluetooth serial adapter. It is quite reliable.
I use IOGear GBS301 (about $65) on the AC jr and IOGear GBU321 (about $20) on my computer. They are both Class1 and will work up to 100 meters (300+ feet). I have not tried it that far, but my computer is upstairs, and signal has to pass several walls, and I'd say distance is maybe 50 feet.
for more description on my setup, click on the little red house www icon on this message.