ftp actually can be incredibly fast even over ten base T.
Lots of little files however and it slows down.
Compressing a bundle into an archive helps transfer speeds.
A standard crossover cable is the cheapest method for transfer.
It might not hurt to invest in a hard drive either within a machine or external USB2.0 or Firewire caddy. You can get raided external hard drive caddies now with an IP address on your own LAN. nowadays.
I would back things up onto DVDs, at least they wont crash if things should go pear shaped.
It may take longer to burn and load but its probably the safest method.
Usb to usb cord as a network cable would be blistering fast as well.