Dangerfield is definitely a lock for me if given FWD eligibility (may not be one of my starting 4/5 MID premiums if MID only, but I'd anticipate him being part of the 8 by mid season).
Martin and Rockliff will be MID/FWD still and therefore locks.
The best Geelong option will be Christensen and I will try to squeeze him into my starting configuration. Great ceiling, and more consistent than Motlop in my opinion.
Other options to consider: Mayne, Pavlich, T. Walker, Gunston, D. Thomas and Wellingham