OK, this is my final answer:
perl -pe'
s!\d{4,}(?=\s)!
sprintf$"x($x=-4+length$&)
."%3.*f"
.qw(M G T)[$x/3],
$x%3<1,
$&/1024**int$x/3+1
!ge
'
which is 104 chars not counting the decorative white space.
  p
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