Color laser printer which can print postscript files without connecting to a computer?

Hi,
I am looking for a color laser printer, which can print without a
computer. ie, through a USB input. Say if I have a USB flash drive, I
should be able to see filenames in an LCD screen and be able to print
files (documents mostly).

I know that there are some photo printers with pictbridge (?) etc. But
I am looking for a small office where the above can be achieved.

The USB drive might not have the capability to send files to the
printer, but I want to see a printer having the capability to read the
files in the USB drive.

Since files may be of different formats, a simpler solution will be to
atleast be able to read postscript files (*.ps) and print it.

Any ideas, suggestions?

Thanks.