Having had or owned everything but a BM bucket... heres the breakdown.
The largest in my opinion are the MSH2, TF, and MLC1. But the MLC1 isnt made anymore, there is now a smaller MLC2, still a good size. The MSH2 is indeed a bit rare but I am sure it will make a comeback. 
And the SGB is only .25 inchas taller if that then the DP95... MS2 is the tallest, being almost an inch or more taller then the other MS buckets.
What I am aware is available in some form or fassion is the BM, MLC2, and the TF. Dont quote me on the TF as he was never in it to do large runs of his bucket. 
But the BM is no bigger then any other mystery helmet unless further mods have been made so it would be the same as the MSH1 and the Sgn Fang. The MLC 2 is a good sized bucket and I can take measurments of the one I am painting for ya if you would like.
