What I usually use is

# vim:columns=80:ts=4:sw=4:shiftround:filetype=perl
use strict;
use warnings;
use feature     qw( :5.10 );
use Carp;
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Most of the time I'm working on older boxes (RH7.2 anyone?) so I delete the feature pragma and stick to 5.6 era syntax. But for my own stuff I try to use something a bit more modern.

And my list of  use statements is always longer than this. Basics like Cwd, File::Basename, and Data::Dumper pop up pretty regularly, as does Moose::* but they are on a case-by-case basis.

- doug