You list 3 EE processors then say the 980X is the first worth having?
The E6600 and E6300 where the go to chips not the E6400. I do remember the 820 but the only thing good about it was the price. 4GHZ on air was impressive but even at 4GHZ the performance was lacking compared to the conroe and allendale chips.
The QX9770 / QX9775 were awesome CPUs, but not necessarily worth the cost. I mention them because they were awesome. Not all the great chips were affordable or bargain bin overclockers.