What is your opinion on Geotrust SSL Security Certificates?

Well, the least I can do (also the most) is bump the question up for you.

The key thing to look for in an SSL certificate is how prevalent acceptance of the certificate is in browsers. Among those you listed there should be little to no difference in this regard, and there is certainly a big difference in price (as you can get SSL certs as low as $10/year) so you should be able to save money based on your current SSL cost.

Secure Sockets Layer (SSL) technology protects your Web site and makes it easy for customers to trust you. SSL creates an encrypted link between a web server and a web browser to ensure that all data transmitted remains private and secure. Millions of consumers recognize the "golden padlock" which appears in their browser to indicate they are viewing a secure web page.

SSL certificates can provide you with non-forgeable proof of your website's identity, and customer confidence in the integrity and security of your online business. Customers are becoming increasingly aware of the advantages of SSL security and will often not purchase online from non-secure stores. All major web merchants use SSL security to encourage customers to buy online.