SSL Certificate

Rapid SSL

Single Domain
No Paperwork

Rapid SSL Wildcard

Multiple Subdomains
No Paperwork

Comodo EssentialSSL

Single Domain
No Paperwork

Comodo EV SSL

Single Domain
Green Bar in Browsers

GeoTrust True BusinessID with EV

Single Domain
Green Bar in Browsers

Symantec Secure Site with EV

Multiple Subdomains
Green Bar in Browsers

Thawte SSL Web Server with EV

Multiple Subdomains
Green Bar in Browsers

Dedicated / Static IP Address

Dedicated Ip address is very useful in SEO Optimization.
Dedicated Ip address is also needed to install SSL certificate.