No one really talked much about the file transfer. If I had an old machine that had a lot of stuff on it then I would definitely definitely go out and get a LAN and set up your two machines so that they can each see the others files. If you have internet access via ADSL or some broadband then its even more compelling.
Buy a router (even if no internet access) with a built in 4 or 8 port switch + firewall. Almost all of them have a DHCP server built in and that will simplify setting up your LAN immensely. Plug in the router to your broadband on the WAN side if you have that and plug all of the computers to the LAN side. With some pretty default settings the DHCP server will setup all of the LAN PCs with proper settings and you can get the internet on any of them instead of just one machine. Also you get file transfer at about 10 Mbytes per sec which means a few minutes or maybe an hour to transfer a hard drives worth of data.
If you really don't want to go down a LAN route (god knows why...) and you have firewire on both machines then that is also an easy way to transfer large stuff quickly.
Buy a router (even if no internet access) with a built in 4 or 8 port switch + firewall. Almost all of them have a DHCP server built in and that will simplify setting up your LAN immensely. Plug in the router to your broadband on the WAN side if you have that and plug all of the computers to the LAN side. With some pretty default settings the DHCP server will setup all of the LAN PCs with proper settings and you can get the internet on any of them instead of just one machine. Also you get file transfer at about 10 Mbytes per sec which means a few minutes or maybe an hour to transfer a hard drives worth of data.
If you really don't want to go down a LAN route (god knows why...) and you have firewire on both machines then that is also an easy way to transfer large stuff quickly.