I am not sure if there is a absolute on what speakers to run for rear channel. THX recomends bipole speakers if I am not mistaken. DTS recomendes something else and Dolby Digital probly recomends something else. Not that imho DD opion means anything. But I honestly beleive that the only way to figure this out is to do lots of listening and pick what you like. What ultimatly sounds great to me or anyone else here may not sound good to you. I am really into making my HT system sounding as good as I can for the money. And I am still working on this paticular area in rear speakers.