what cables I need to transfer Sony GV-HD700 HDV Video to iMac ?

You must use a FireWire cable from the HDV deck. This is also called iLink by Sony. If your computer does not have a Firewire port, but does have a Thunderbolt port, you can use a Thunderbolt to FireWire convertor:

http://store.apple.com/us/product/MD464ZM/A/apple-thunderbolt-to-firewire-adapte r

and a FireWire 9 pin to 4 pin cable.

MtD