I was thinking something like this:

Heavyweight Rankings (200lbs & above)

1: Chris Byrd
2: Wladimir Klitschko
3: Hasim Rahman
4: James Toney
5: Serguei Lyachovich
6: Samuel Peter
7: Oleg Maskaev
8: Lamon Brewster
9: Calvin Brock
10: Nicolay Valuev

I think Brewster is still better than Valuev. It could be a toss up with Brock, but I think that Brewster's wins have been better than Brock's lately. Anyhoo that's my 2 cents.