Need recommendations for buying UNIX system

[willis at violet.berkeley.edu.UUCP]

I want to buy a UNIX workstation.  I'll use it mainly for software 
development in C and Prolog.  It should be fast and be available with
a fairly well debugged version of UNIX.  Cost is an important consid-
eration, as I'm still in grad school.  Any recommendations / reflections
will be greatly appreciated and will be summarized, if there's a demand,
to the net.

Thanks,

Willis Johnson
willis at violet.BERKELEY.EDU
  ...ucbvax!violet!willis