Im planning to sell my Mid 2011 13" MacBook Air and my Mid 2009 MacBook Pro and buy a 13" Retina MacBook Pro. Probably the base i5 2.5GHz with 128GB SSD and the extra cash goes to a casing or probably ACPP. How fast is the rMBP i5 compared to my 13" 2011 MacBook Air i7? I know Intel HD 4000 smokes the 3000 but how about raw CPU power? Cuz im comparing 1.8GHz Sandy i7 vs 2.5GHz Ivy i5