I'll put in a vote for Royal Flush. Sort of a multiplayer Jacks open. I own one of these and play it at the VFW quite often. I also have a couple of Target Alphas and a Space Oddssy or whatever. I had hands on an Aztec once, but turned it down. I'm sort of glad I did now. I like the game, but can't afford the room for it - giving it a spot that could be used by a Wedgehead.
Most of them are of the lather, rise, repeat variety. So their inclusion in your collection may be predicated on how many other games you have and how big your room is.
If you are painting a picture in your mind of you and your friends and family blissfully playing 4 player games of Target Alpha for hours on end, put down the joint and face up to the reality that it will be you sitting there shooting the same ball over and over that one week a month when your wife is unavailable. If you have 9 games and want to add a tenth, it might make sense. Your collection looks like you have 3 DMDs, so you have nice, deep rule set multiplayers already. If you are looking to just add an EM, I would encourage you to get a good playing single player.
If you are thinking of....get....
Royal Flush......Jacks Open
Target Alpha ..... Eldorado
Lawman........Atlantis
etc.
Most mediocre one player games are better than really good multis (in my opinion of course)