I personally wouldn't match Joshua against any of the better British heavyweights. That includes Fury/Haye/Chisora/Price
Wait for that until it means much more as for now it will only harm one of them with no massive gain for the winner as it will be unlikely to be an eliminator of some sort
I would be looking at the likes of Tony Thompson, Ustinov, Adamek, Kevin Johnson - These fights would provide experience with world level challengers at some point who can also take a punch.
The one criticism so far is that he hasn't been matched with a 6ft3+ heavyweight. They have all been on the shorter side and would need experience like that before facing Fury or Price especially