It will take a little memory, but it cracks on a bit :)

#! perl -slw
use strict;
use List::Util qw[ reduce ];

die 'Usage: $o <dir>' unless @ARGV >0;

print reduce{ -C $a > -C $b ? $a : $b } glob for @ARGV;
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Or as a one-liner

perl -MList::Util=reduce -le"print reduce{-C $a>-C $b?$a:$b}glob for @
+ARGV;" 
cache/*/*/*/*
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Caveat: Will need adjustments for *nix.