I think it depends on your listening/viewing tastes. If your usage is heavily weighted toward DVDs (movies) and standard (redbook) CDs, then 4 QS series speakers would be my suggestion. If you're really into DVD-A and SACD, then having the direct radiators in the rear is preferable. If you're crazy about both, you have a decision to make.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton