HELP! ~~ How to choose SSL??

[唔系坏人]

Secure Sockets Layer (SSL), are cryptographic protocols that provide communication security over the Internet.[1] TLS and SSL encrypt the segments of network connections above the Transport Layer, using asymmetric cryptography for key exchange, symmetric encryption for privacy, and message authentication codes for message integrity.
http://en.wikipedia.org/wiki/Secure_Sockets_Layer

Reliable is the most important, our tech used GlobalSign, u can try that
hk.globalsign.com/campaign/spring_festival_2012/