this is the link to it http://www.pricewatch.com/2/26/78-10.htm. Its the only 80.gb one and is named 80.0GB Udma MAXTOR HARD DRIVE 7200RPM 80GB harddrive Optional usb / firewire case.
If its internal and uses IDE, then it'll work. Maxtor is the best brand if you want a locking hard drive, so I'd get it.
hmm dunno bout the best, but theyre the cheapest, unless you shop ebay etc Ive done half a dozen or so hdd mods, always used a seagate, never had a prob locking it. To be honest though, there is no reason to lock your drive. If you use xbox live you can access MS dash from evox.