I have been waiting for a thread like this one so I could share my research findings and hear others opinions of it.
Some of the lights that I found fall into the category you mentioned is the NeoFab Legion II which I have written off because of its price and I am guessing these are handmade one at a time and take long to fill orders. The Dereelight DBS, Tiablo ACE MC-E, and the MVP P-7 fall into this category. I have found that the M1X is both brighter and out throws all of these lights.
I currently own the M30 Triton and use 2x 18500 batteries and will likely never turn back to using CR123's as the 18500's last more than four times as long as 3x 123's, and do not require the use of the extender tube. The M30 is a really solid built light and comes in a really nice case. So far it has been a great light. It does not come with a nice belt holster, but I found a gun magazine holster at the local Army Navy surplus store that fits it great. The thing is that it is definately not a thrower. The hotspot is nice and big and there is no ring in the spill. Very nice beam. Three brightness settings and a strobe with a dedicated button for it when the tail clicky is set to off.
My research has narrowed me down to the M1X (which you already have), the Ultrafire RL-2088, and the WF-1300L. Both ultrafires claim 1300 lumens (not sure if it is out the front or at the emitter). The RL-2088 seems like a solidly built light contrary to a lot of ultrafires but is out thrown by the M1X. It ranges from $150 - $160 and comes with a custom belt holster depending on who you get it from.The WF-1300L is a beast with 7x P4's but has had problems arriving DOA and dying shortly after delivery. It has also had some construction quality issues. It seems like either of these are a gamble, The 1300L because of its construction quality, and the RL-2088 because it is being shipped overseas and the dealers are hard to communicate with. I have not found a US domestic dealer for the 2088. The WF-1300L can be purchased for $130 USD but that is coming from Hong Kong. The only US dealer is Battery Junction and they are asking $175 for the light which I would be much more inclined to buy from just because you are dealing within the states and they will be much easier to deal with if it should have a problem and you have to return it.
That is as far as my research has brought me. I personally am leaning toward the M1X but it is no brighter than my M30. Either of the ultrafires will out do it as far as brightness, but I do want some throw. (Of course I am used to the throw of the M30). But I hope what information I can provide will help you in your quest. Good luck, Dan.