Anything that deals with electrical will be a fortune. $400 is kind of crazy! As for the tune, are there any other shop that does tuning? You can always wait for maps be available for download. $400 can get you a set of rubber and a few other things. i.e exhaust protector, block off plates, exhaust hanger, and better brakes! haha
I'd say wait after 600 miles service to install the parts since you're not that far off from it.