The Gurus agree, Ion is the best:

Ion has built-in intelligence that is critical for solving complex tuning problems. It's clearly the best Oracle tuning software on the market. Steve Karam Oracle Certified Master

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Purchase below via credit card.

Ion Enterprise Special Introductory Price

Oracle Databases Total License Fee, US$ Purchase Each Instance $1,995 Unlimited Instances $9,995

Individual ION Components Special Introductory Price

ION Feature Fee per Instance, US$ Purchase ION Expert Analyzer $425 ION Metrics $750 ION Scripts $1,350 ION Light $50

WARNING
ION is designed exclusively for senior Oracle tuning professionals
and it is not appropriate for beginners.