Best type of RPM package key signature?

[Keith Roberts <keith@xxxxxxxxxxxx>]

Hi all.

I'd like to create my own Centos 5.5 repo, and I'm looking 
at this page about generating a key to sign my packages 
with:

Generate A GPG Key To Sign RPM Packages Created Using 
rpmbuild On CentOS Linux:

http://www.question-defense.com/2010/03/04/generate-a-gpg-key-to-sign-rpm-packages-created-using-rpmbuild-on-centos-linux

Also:

http://gagravarr.livejournal.com/137173.html

What type of key would be suitable for signing my packages, 
and one that would give me a good level of security please?

Kind Regards,

Keith Roberts

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