It depends on what level you are at and what you are trying to accomplish. If you are just starting MT...then Eaton and Parish are EXCELLENT centers....now you just need to pick up a few more value guys.
I recommend Bob Lanier who is really cheap. I have him on one of my squads. For 2nd and 3rd center off the bench....silver and bronze Tree Rollins also silver and bronze Dawkins.
If you are more advanced and have some MT to spend....I would get Anthony Davis and put him at Center some times. Ruby versions of Cousins, Horford, and the Gasols are all good and affordable for anyone.
When you get up in price....I have Pat Ewing and of course he is no joke. The only other Center I would spend my MT on right now is Hakeem. Gonna see if I can snatch a PD Shaq next time they drop a code but I aint buying him anytime soon.