Don't forget that you do also need to have a dedicated ip address, which you will have to buy in from your hosting company - and you will need to have the ability to install the SSL Certificate yourself.
In the case of the company named they provide Comodo SSL Certs (as we used to do), but since Comodo were hacked around two months ago ALL certificates they issue have to be manually validated (faxing of documents etc). This is a long and tedious procedure.
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