If you have time check out this thread...
It discusses putting hops in the kettle after flameout (so wort is not boiling) and let sit 20-30 min or so before cooling in order to get more hop aroma. One person did an experiment comparing this method to the standard flameout hops + rapid cool and posted the results. Since you have to wait anyway, you could just add hops AFTER flameout to get the benefit of a hopback-type device without having to build one.
that...and dry hop.