> I'm looking at audio digital interfaces. Is firewire worth the possible hassle of > needing a port for it?
A lot of firewire audio devices tend to be higher-end, but other than that I wouldn't go out of my way for firewire. If you go USB, just make sure it's a USB 2.0 device. There are some cheaper, consumer devices that still use USB 1.1, which doesn't have the bandwidth for high sample rates/bit depths and low latency.