I have some decent gimbal experience. I would recommend the Crane 2 for your EOS M. It's made for larger cameras, but you can't beat it's battery life and features. The LAB is good too, but you can find the Crane 2 for around $200 usd on ebay.

I agree with Jonit that the Crane M2 would be okay, but I'd still go with the Crane 2.
There are two things that suck when using a gimbal and canon/magic lantern:
1. There is no autofocus. You will need a follow focus system. Luckily you can buy the Crane 2 with a follow focus system and you'll be set. Trust me it's pretty annoying to try to focus using your hands on a gimbal. Especially when on longer focal length lenses
2. Swapping batteries is a pain.. Especially for the EOS M (875mAh per battery). I would probably a battery port and connect a beefier battery to the gimbal. Something that looks like this:

Here is a picture of my setup. I use the 5D mark II connected with Sony's amazingly cheap and beefy NPF batteries. This setup lasts me for 8+ hours on a shoot. I'd only have to swap SD cards because of large ML RAW files. This entire setup costs under $950 including camera and lens.
