Recently I was involved in couple of cases concerning plan cache taking more than 20% of the SQL Server Buffer Cache and although there is no fixed threshold/best practices value, I noticed that there were a lot of identical statements getting cached. Effective plan caching is important for optimal performance on SQL Server and I will not get into details why. If you want to further read on plan caching, there is a great whitepaper on MSDN – Plan Caching and Parametrization
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