I'm going to purchase a new MBP (May 2015) Retina 15".
I will be using it mainly for software development and programming, Ruby, Rails, Angular JS, Git, and HTML/CSS3.
This probably gets asked a lot but my question is what would the consensus be on upgrading the processor? For £80 I don't mind going up one notch to the 2.5Ghz i7, but unless I'm doing hardcore stuff i.e. graphics/movie editing, am I just throwing money at a wall? Also will time play an effect on the speed of this? i.e. 3-4 years down the line? Will there be a noticeable difference?