BikerDave...
You worry about GSers suffering from "bolt on fever"...? Having just rebuilt a Harley Softtail I can assure you, I'm just as interested in improving my GS... only difference? The price...BMW has its pricing regime well in hand considering what Harley bits set you back.
Since buying the GS, I have to put my hand up and say the Harley's been sitting in the garage for quite a few months now!
So, get out there and start the process... the sooner you start, the sooner you can finish and get on with another bike build... where will it all end?