We’ve got a promising opportunity for one of our clients for some coverage. However, we’re in need of some video conferencing kung-fu. Does any locals have a system which we can borrow, rent or steal?
Alternately, have you used any professional video conferencing services in Vancouver? Any recommendations?
DarrenBarefoot.com 
why not use one G5 and iChat AV and some iSights?
probably because your client is not on Macs!
Don’t know if this is what you’re looking for but you might check out the local universities. Like SFU–I’m pretty sure they do video conferencing.
http://www.lidc.sfu.ca/audiovisual/conference/index.php
Check out the Access Grid:
http://www.accessgrid.org/
Most universities have at least one AG facility.