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Duplicate Check New Case Override

We have very high volume Case usage.  We have an issue with duplicates.  I am looking to create a way to check case subject lines on 'New Case' attempts.  If the subject line has a match, we prompt with the Case.CaseNumber of the match that was found.
Has anyone implemented a similar override or a new button that allows new case creation but will check for existing items? 
I was able to get this working for checking on duplicates, but does anyone have an idea on how it could be implemented so that I can run a check when the user tries to first save the case?  I thought I remembered reading you cant add content to the edit mode pages, and I would need to either create a new Save button or override the existing one that is used in the Edit Mode page in order to check at creation.
Ron HessRon Hess
you could follow the method of this app

which asks for some info, then searches, then allows you to add the record

you will have to modify this for use with cases i believe, but the concept is there.