Hey les,
I suspect you haven't received any responses because there probably aren't many people who have experience with all three. For myself, I own or have owned many Malkoff and Elzetta products including a couple on your list but not all.
In short, they are all great options. The 3 cell Elzetta host means you have access to the M91 series and the 3 cell Elzetta AVS head which means more lumens. The real advantage of the M61SHO was that it could be run on 2 cells but still provided more output than the regular M61. It also threw better than the M91 that was out at the time but since the new M91B uses the XP-L, it's throw numbers are likely right there with the M61SHO and it puts quite a few more lumens down range to boot. The beam profile of the M91Bis going to be perfect for what you're after. It will light up everything in front of you with a huge hot spot and nice transition to bright spill. Coon's and possums won't know what hit 'em!
As for the Elzetta, you're going to get at least as much output as the M91B (a little more perhaps) but Elzetta claims about twice the lux. It's the one on your list I haven't owned so I can't say for certain but logic dictates that the spot will probably be a little smaller and the spill will probably be a little dimmer, meaning a more stark transition from spot to spill. It's really up to you whether you want that extra light in the spot or the spill.
Another way of looking at it is the Malkoff is cheaper. You'll also be able to stick it in a Malkoff, Surefure, or whatever other host you may wind up with someday while the AVS head will always be destined to ride an Elzetta host. Finally, you have the option of a warm version if you go with the Malkoff (assuming that matters to you).
Good luck and let us know which way you went!
-G