i need to buy an external HD, but i am unsure of which one to get. there is a LaCie 320GB USB 2.0 for 85€ and a LaCie 250GB FireWire for 115€ im intersted in. but you can see right away why im so unsure on which to buy (if your cant ill explain it now) the first one has 2x the storage capabilities then the 2nd and costs much less, however its USB. the other, well has 2x less the storage of the 1st one, costs more, but is FireWire. What i ask is: is the difference from FW to USB so big that its worth paying more for less storage?