Now this is a Parlee...
If you are really interested here is my personal opinion owning both models, first of all the 595 is discontinued, the current model is a 596. I have a ridden a 595 for a few years before I bought the 695 and currently use it as my winter bike. The 595 is a great all around bike and as you stated provides the ability to customize the stem and cranks. From a performance and handling perspective the 695 is head and shoulders above the 595. The power transfer of the Zed 2 crank set is flawless it is like nothing I have ever ridden (the 595 is full campy super record), the handling and cornering is far superior and the road feel can be dialied in using the different polymer. I average over 1 mph faster on my training rides with the 695 over the 595.
My experience is that the 695 is a tremendous step up like going from a Porsche to a Ferrari but your experience may be different
My next bike will be a Time or a Look.