You get up to 7 additional ips free. I usually trouble ticket for those within 10 minutes after the box goes live.
If you look to left of the page in your link you will see a link to "Install Certificates"
Under there is a
link to Cpanel
WIth Ensim the $19 certs are a pain in the butt to install. It does not look like it is that bad for you. After two bad experiences (certs not matching the request keys) I now use the $49 exclusively.
I do not have cpanel, but certs are certs. Even a self issued cert provides encryption (if the browser supports it Internet Explorer fakes it and does not). Which cert doesn't really matter in regards to the encryption.
What matters is ease of install. With the geotrust $49 I can install a cert in under $10 minutes if I get distracted and not really paying attention. Under 5 minutes if I am.
Back in March someone did a HOW TO thread for you:
How To install a cert on CPanel
Hope this helps...
The trick is: don't over think this. It is really actually easy.
Oh yeah one more thing make sure you have an
admin@ssldomain.com if you are not the registered domain owner. You can use that to have them verify the request.