Okay, enough with the Kumbaya crap.
A few myths to dispell. But first, to the OP, if you're going to be recording 1 or 2 tracks at a time, a USB 2 unit will work just fine. I don't even think you can find a USB 1.1 unit anymore. Consider an interface that has good mic pres and bundled software, like Cubase LE or Sonar LE.
USB2.0 is faster than Firewire400, but not by much. In raw numbers, firewire is 400mbps and USB 2.0 is 480mbs. However, firewire can stream more data in a given time than USB. Why? Well, it's not anything like the highway analogy. In fact, both protocols are SERIAL which means, one bit at a time; only one lane. Firewire can handle more data because the transfer handshaking protocol is controlled at the device level verses USB where it's controlled by the cpu. With USB, the cpu uses interrupts to manage data transfer, data has to wait until the cpu is available to address the transfer protocol. Therefore, USB is much slower than firewire. I think USB 3.0 addresses this shortcoming and will far surpass FW800 when it is integrated.
This is the newbies section and we don't want this thread to get out of control with personality conflicts. So be polite and stay on topic.
peace,