Is it a PL21 getting taken out? If its an EFIS system, the G1000 is tons cheaper to upgrade to. Much more bang for your buck with the garmin. If a component gets broken on a PL21, like say a PFD or major component, a G1000 replacement isnt too much more than just replacing the one PFD on a PL21.

Also, from what I have heard some 91 operators take out the PL21 sell it, and install a g1000 for much less than they sold the PL21 for. I personally thought the G1000 was very user friendly. never needed any more functions that it had in the King Air 350 I flew. But I have never used a PL21 myself.