iPhone 5 Do I need it?

Debating...been a decade long Blackberry advocate, but I have reached an impasse with RIM.  Engagement is too compartmentalized, gadgetry is less than outstanding and usefulness is obsolete.
So the real question is do I need an iPhone 5 or the soon to be more economical iPhone 4s?  It begs the questions with the new 5, Apple's tendency to upgrade technology by changing the infrastructure of chargers and device connectivity which is illustrated on the new 5 needing an adapter to interface with other Apple products. Not too cool on that but I understand the constant 'evolution' theory.  Just doesn't benefit the consumer at all.
I like the idea of staying behind the curve, next gen technology always has kinks just wait.
My verdict. 4s, proven, reliable and more affordable.