As you are comfortable with Canon then stay with Canon. You will have the confidence of the past to support your purchase.
Canon provide excellent cameras with some having large diameter lenses for low light. I had a Canon HV20 tape based camcorder for 5-6 years which performed well but, as my new PC had to be fitted with a FireWire card which proved difficult to get working, I moved to Panasonic SD card based cameras. I still like Canon and they are included in my research list.
You may do well to spend some of your budget on lighting. Lighting is still the key to good quality video. All the modern cameras have video amplifiers to "up" the gain in low light situations These amps are so much better now but will create "noise" when cranked up too much. My "new" Panasonic 750 boasts cleaner amplification in low light but it is still visible when I push the camera too far.
So if you are happy with Canon then go again with Canon.
R.Proffitt's point about "upgrading" to HD needs to be considered. At the viewing end most TVs have HDMI inputs so you can plug the cameras straight in BUT if you propose editing and production of a DVD then an up to date PC and decent video editor would be the best way to go. An editor would allow great flexibility - for example - should you decide to record the audio on an independent recorder fed, say, from your PA system, you could use the audio and sync it with the video in the editor - again an example - if you use more than one camera then a good editor allows easy switching between shots.
The editor I use is Corel's VideoStudio Pro X7 and covers the examples above. I use a Fostex MR16 and a Zoom H2 for audio recording.