Just to post a follow up to this.
www.freessl.com (a GeoTrust company) have a cheaper certificate which is not chained and the give you an extra two months when you make a purchase. Also, you can try their certificate for 30 days completely for free. This allows you to see if it works to you liking and actually does what it is supposed to do. I did this today, and I have a ticket in with the Micfo techs right now to update this certificate to the full StarterSSL.
All of their certificates work on the popular Mac browsers, even though they do not advertise this ( they should ). I have personally tested their freeSSL and soon StarterSSL on my micfo account with:
IE (Mac and PC)
Firefox (Mac and PC)
Safari
Mozilla (Mac, PC and Linux)
That alone covers a huge chunk of the browser market and any potential customers to your secure store.
The only small point I have with StarterSSL, is their web seals look a bit amateurish compared to others. Not such a big deal when their certificates offer excellent compatibility.
If you have any questions about my experiences with either Godaddy / Starfield or Geotrust / FreeSSL, i'd be happy to answer the best I can. Send me a private message.