What HD cam for low light?

This is my first post here, so be gentle!

I'm very close to making the decision to buy the Canon AX10 but want to get some more opinions about how it ill suit my needs.

I had a Sony handycam that was 10 years old and loved it, but it died a while ago and now its time to replace it for home use and also for some business possibilities.

I'm going to start shooting some weddings so I need something that works well in low light, is HD, easy to use and has good audio options.

My wife is a very successful (wedding) photographer and uses Canon 5D MKII's but I'm not keen to use one for video because of its audio limitations and battery problems, and to be honest being from a TV background I'm much more comfortable with a dedicated video camera.

So my biggest concerns are how well the AX10 works in low light and what directional mics and compatible radio mics are available for it, although I don't think that's camera dependent...I like Sony (mainly because I've had one) but nothing they offer seems to compete with the AX10 for price and features. The VG10 is a consideration but the interchangeable lenses might become more of a hassle compared to a 'fit all situations' fixed lens, and the mic looks good but I worry how good it realty is compared to a separate mic.

I'd like to find out how well this little camera works for shooting weddings (ie Low light) how well its audio options stack up and what other cameras I should/could consider?

Cheers

Thanks for the reply Kevin...I appreciate the comments.

I don't really have a particular budget in mind but I suppose I want to keep it around the 3-4 grand to start with.

A second camera is definitely in my plans. As much as I'd love to have 2 identical cameras so the shots would match perfectly, the reality is that the second camera is likely to be a very simple low end (ie much cheaper) HD video camera...do you think that would be a problem or do you think the differences in quality wouldn't be that noticeable given that its a wide shot and not much detail?

Cheers

Thanks for the reply. I do intend making use of the XLR's and the price difference isn't that much, so its worth it for me...

I assume that the pro sensor in the M40 means the pictures would be close or similar...would a cheaper low end HD Canon with CMOS ($400/500) work as well or not? The M40 seems to be around $1000 and I'd rather spend the money on audio...!

Thanks Paulo

The M40 was being considered purely as a second camera for a locked off wide. The G10 was being considered against the XA10 but I'm looking more between the XA10 and the XF100.

The 5d MKII option is something I want to explore but its unlikely I'd be able to use my wife's as we'd be shooting at the same wedding!

For me I think the perfect set up would be the 5D for mostly hand held and the XA10 for the tripod wide, but not sure I can stretch the budget that far when I have lenses and mics to consider! Its a juggling act right now and I'm considering hiring a second camera for the short term and just concentrating on my main camera!

I have decided to stick with a dedicated video option and leave the DSLR until later on. To me it's limited despite the fab pictures. I might add one further down the line.

So it kind of leaves me deciding between the XA10 or stepping up to the XF100, unless theres something else to consider? Seems like there are lots of pros and cons for both and I'm not concerned about the price difference, so I guess it's down to making a decision.

I want to shoot slo mo quite regularly without losing any quality or having to mess around in post (with a less than impressive result)...is the XA10 capable of this or is it only something that can be done properly with the XF100?