Digital BW, The Print

I haven't looked into this for some time, and since things change weekly,
I'm wondering whether it is now possible to buy a desktop scanner capable of
getting the results once associated only with professional scans.  Or is
there still a huge leap in quality between what can be produced at home, and
what West Coast Imaging can produce with their Tango Drum Scanner?

I recognize that this question depends very much upon film format and degree
of enlargement.  I do, however, shoot medium format and 4x5 as well as 35mm,
and is it perhaps possible, with an affordable flatbed, to get professional
results out of these larger images?

West Coast Imaging argues that you should have them do your scanning *and*
your printing, for the best results.  Clearly most people here feel that
they can get the prints they require out of their personal Epson.  Is
scanning also at this level?

(This is not an implied criticism of West Coast, who are by all accounts one
of the very best shops.  Simply wondering whether the dedicated individual
can replicated these results.)