I recommend sony minidv cameras (the best ones IMO are the ones that record to tapes as opposed to a DVD or an internal Hard Drive) if you are working with iLife'06. Canon has great products also. JVC is so, so (yes they work on most macs but not always as well as sony and canon). Some folks experience driver issues with canon products, but frankly that has not happened to me ....ever.
Make sure the camera works with Firewire and has digital pass thru features so you can also connect existing analog sources to your mac. Great Feature btw! It will save you from spending a few hundred on one of these devices down the line
(media converter box):
Lastly make sure it defaults to 16 bit audio and not 12 bit.