The LCD on the camera is a good judge, but shouldn't be the straw that breaks the camel's back.
I found that all DV cameras are lacking in the low light department.
I'm in the U.S., so my model names will be different, but I have a Canon Optura 200MC and an XL2. I really like Canon across the board. Canon also uses optical image stabilization, rather than Sony's digital image stabilization, which ends up costing you some pixels to compensate for the movement. Of those two, I'd go for the Canon. They are all about images and know it well.
The bad about my Canon, an what you may face with the MVX30i, is that "matchbox" style cameras place the mic on top of the camera. On mine, in quiet conditions, it picks up the noise of the motor. I highly recommend that you take a pair of headphones to the store and listen for this. My camera is much older and this issue may be a thing of the past. At the time, it was not uncommon on most small DV cameras.
Here's some other food for thought.
I'd consider getting a camera with a manual focus ring. I personally think it's a must have feature. From my experience, those without have a little dial wheel on the back that is about as responsive as a dead hooker.
If I were buying a camera today, I'd go for the following two choices. I like the Optura MVX4i / Optura 600, with its large, native 16:9 CCD, and standard size lens of 34mm. You'll find it easier to buy protective (UV) filters for this over the MVX30i. I also dig the 3 CCD Panasonics. The only thing I do not like about the Pannys is that they are not using 16:9 CCDs. You'll get 16:9, but it'll be at the sacrifice of some pixels.
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