You may want to consider the Digital Blue series from Disney. There are several styles and options to choose from and their designed with kids in mind. Easy to use and inexpensive.

Importing from USB to your Power Mac should work fine. It appears that the G4 Power Mac running iMove '08 will not support the ACVHD format, Intel Mac's running Leopard will run ACVHD native using iMovie '08 much better. There are some Third Party AVCHD conversation utilities available that will convert the footage to Apple Intermediate CODEC, and then you can import the converted footage into iMovie or other editing software. The Canon HG10 does not have a Firewire Out connection, only USB and A/V (Audio Video) Out. Hope this helps.

As has been mentioned, the white balance could be one source of why there is a color “tint”. The first thing is to check if the camera is in Auto White Balance mode. If not then set it to Auto. Another possibility, which I think may be the problem, is that the camera has the AE Shift set to a – (negative) setting. This will cause the camera to shoot darker than what you see on the LCD screen or in the view finder. Shooting indoors when there is not enough light wil cause photos to come out a little yellowish. It is very easy to accidentally change the AE setting. Check your manual to find where this setting is and make sure it is set to the middle ( 0 ) mark. If this is a Digital-SLR, check the AE Shift, and while in manual mode, adjust the aperture and shutter settings until you see the meter in the view finder get to the center mark. This will give you proper exposure.

Best Buy does offer camera repair.
Although our in-house Best Buy Service Centers do some repairs, the majority of repairs are completed by Precision Camera Repair. We are set up with a "Direct to Vendor" model (DTV), which allows us to UPS the customers unit directly to Precision, who when completed, will UPS the camera directly to the customers house. The average turn-around-time (TAT) for the repair from when the customer drops off the camera until it arrives back at there house is 7 days. This applies to all cameras under Manufacturers Warranty as well as PSP. We also repair out of warranty cameras that should enjoy the same TAT, if the estimate is approved promptly.