Mihm compared to other WC centers

I wrote this on 8/12 (Link)
I have seen several posters say that Chris Mihm isn't up to being a starting center and that he should be a back up. I think that he's an average center who doesn't really hurt (or help) the team.

To test my theory, I pulled the PER stats from 82games.com and the difference in PER stats for each of the starting centers in the Western Conference. As I expected, Mihm comes out in the middle of the WC centers:
Phoenix - Amare Stoudemire (29.2/+11.2)
Houston - Yao Ming (24.9/+10.3)
Sacramento - Brad Miller (22.0/+4.7)
Utah - Mehmet Okur (20.2/+5.4)
Denver - Marcus Camby (19.3/+3.0)
Seattle - Danny Fortson (19.1/+4.2)
Dallas - Erick Dampier (16.6/+1.0)
LA Lakers - Chris Mihm (16.2/+0.8)
San Antonio - Nazr Mohammed (15.8/-3.0)
Memphis - Lorenzen Wright (15.4/-0.7)
LA Clippers - Chris Kaman (14.1/-2.2)
Golden State - Adonal Foyle (13.6/-3.5)
New Orleans - Jamaal Magloire (13.5/-2.0) *Injuried much of season
Minnesota - Michael Olowokandi (11.3/-2.0)
Portland - Theo Ratliff (11.2/-4.8)