This deal has ended.
Dell's best pound-for-pound desktop deal is this Dimension E521 for $669. It has the new AMD Athlon X2 Dual-Core processor, 1gb memory, 160gb hard drive, 16x DVD / CD burner, 256mb video card and a 17" LCD flat-panel monitor. Coupons don't work with this, nor are they really needed as the pricing is very good. Shipping is free.