What would you all recommend as the best hard drive for use with Time Machine? USB 2.0 vs Firewire? Is Firewire that much better? Are there any good RAID options out there? Will Time Machine backup over the network? Also, since Steve Jobs pissed me off when he said this is an "all in one world" at the last iMac release, when is Apple going to start building a second hard drive into all Macs for Time Machine to back up to??? This is an all in one world, right?