Over at Genetic Future, Daniel MacArthur is wondering what everyone wants to know: why buy Navigenics' Annual Insight service for $500 when you can have 23andMe's full genome scan for $100 cheaper? Navigenics recently announced an alternative to its $2,500 genetic testing service, the Annual Insight service, which costs $499 and analyzes genetic predisposition for ten common health conditions, including breast cancer, prostate cancer, colon cancer, and heart disease.