Hello there. I am going to buy a Focusrite Saffire Pro 24DSP interface, which will be working along with Shure SM7B or Shure Beta 58a. Right now I just need to choose which FireWire to use and I have no idea. Is there any difference between FireWire 800 or 400? And most important is 800 for every computer with FireWire? (got ACER 7730g) There is no big difference in prices between FireWire 800 or 400, so if there's at least minimum possibility to have less latency/ better sound quality I'll buy 800. But as I said, I don't know does it even work with Saffire, or my laptop. Thank in advance for answers! P.S. what is better for Focusrite interface - windows XP or windows 7/64?