a reverse sensor system may run $200 to $300 as a rough estimate and maybe 1-200 to install at a shop.
instead of sync you can always get an aftermarket headunit with usb and bt built in it. cheaper and more reliable.
cruise you can buy a steering wheel with the cruise buttons on it. then all you have to do is install it and then take a it to a dealer to go in the computer and activate the cruise (only a dealer can do that).
not cheap to add all that, but def doable if you want it.
2010 Volvo C70
2011 Harley FLHTK
Midwest Crew #22