the v1 will have a winchip in it, you should replace it with a winchip 2, unless you want to go through the split plane voltage mods.
cables. best place to get connectors is: nw cable and connector. 44 pin ide idt connectors are 2.25 each, you will need 3 plus some 44 cable from them to make an adapter to to run a 2.5 in drive. however, if you are going to run a 3.5 drive, get a 2.5 -> 3.5 adapter ( www.compgeeks.com or whatever) and 3 40 pin idt connectors. you have to flip the pins (pin 1 -> pin 2, pin 2 -> pin 1, etc.)
you will also need enough power from somplace to run the drive. a 30 gb western is a lot more drive than you can power from the internal power.