This.
Goodwin started hitting stride at the end of his years here, and is a solid starter in the league now.
DLP emerged last year as a center worthy, in my opinion, of top 15, maybe even top 10 consideration. based purely on stat crunching his run blocking is top 10 among centers and his pass blocking is well above average (less than 20 pressures allowed last year)
Other than that I just dont think there are enough big name centers to go around, there are only a handful of "dominant" centers in the league, and they rarely become available.
Our bread and butter will always be Elite level guard play anchoring the line since it sets the interior pocket for Brees.