@webconfigure - please clarify "better security" since everyone uses a 2048 key.
@easyhostmedia - the part that trips me up is "give more assurance", mainly due to what a customer sees when they visit a site. It would be rare (very rare) for a user to view the type of certificate purchased, usually, they just check for a lock.
1) as a user, do users care how long an SSL is valid (much like do they care if you buy 1 year domain or 10 years).
2) For SSL support - as anyone, in their lifetime, contacted GeoTrust or Comodo for support (other than an installation which a host should take care of)?
Why not use a free one on an e-commerce site?