i wanna buy a a lacie d2 drive; some come with the firewire 400 and
others come with the firewire 800 and usb 2.0. I'm thinking about
getting the 320gb.

the ones with the firewire 400 only are a better deal size/price wise.
does it make much difference in performance if i miss out on the
firewire 800 and usb 2 functionality?

(p.s., i use a PC)