Hmmm... to me the YKLE and DM series sized handles feel a little too small for me.
I really like the RMD handles. Personally, it's the only handle that I like from Swamprat, aside from their Res-C. The chopweiler bulb handle looks weird and the M6 has just a really bad weight to it.
From hearing all of this, you guys will probably agree that the RMD does have one of the best handles.