If we accept SSP as the gold standard for Dikshitar kritis, then I have to say that TMK's version of Shri Neelotpalanayike comes closest in terms of authenticity. Not only does he sing it with Suddha Dhaivatam (as it should be sung), he also adheres to the SSP very closely (almost note for note).
With all due respect to BMK et al, I don't know why anyone would sing it with D2.
Also, I noticed in the BMK version that he does not sing the SwarAksharams correctly.
For e.g. in the Charanam, "samasta vishvOtpatti sthiti layAdi kAlE", the "pa" in vishvOtpa needs to be sung at P. BMK sings it at S. Things like this tend to take away from the richness and grandeur of the kriti, IMHO.
TMK version can be found on YouTube:
http://www.youtube.com/watch?v=T-_gDV_hUd0