My estimate for instruments for my Skyranger Swift project (A "hybrid" panel: some digital, with basic "steam guage" backup)... ASI, ALT, MGL "Extreme" EFIS with AH and compass senders, MGL V10 radio, Airbox Clarity GPS, mode C transponder and all switches, circuit breakers, isolator, etc, is around $9500.00. I already have an electric turn coordinator, so may as well use it (for it's rudder ball if nothing else). That's my tentative plan, I may change some of the components.
Cheers, Jim.