RAC or Not RAC

Hi All,
  I have a question that may be a touch backwards.  My option is to
create a standalone instance on 10G or single-node RAC 10G.  Aside from
support, does anyone have any pros and cons to potential approach.  If
we move to a standalone instance we can stablize our application and
upgrade to RAC.  If we go with RAC I can just add a node when it
presents itself.  I know the RAC pack suggests a standalone instance
rather than a single node RAC and I'm inclined that way myself.  Could
anyone add their insight/experience? 

Thank you, 

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