You know, every month I look for a firewire scanner and never find anything. I didn't go to CES this year. So I missed my chance to ask that very question. It took a while to get any decent scanner in USB, it's just a matter of time before the firewire models come out-at least that's what I keep telling myself.
The UMAX PowerLook 1100 sounds ok, only 1200 dpi but it has an optical density of 3.4D, so pretty good for a flatbed (it might come with the transparency adapter.) I didn't price it, but it is probably close the PowerLook III which goes for about $1100. I decided to settle for an epson 1200U (1200 dpi, 3.0D) with a tranparency adapter until something better comes along. I get pretty good results, so I can't complain.