since I could probably have him for another 10 seasons or so
Hopefully in ten seasons you will be in DII (or III or NBBA), then he will ride the bench, or be a minute scrub. You should train him, or be looking to upgrade.
I would look for 4 or 5 star centers, minimum 6'10". Potential should be minimum 3 stars, preferably 4 or 5.