All,   I have begun preparation for a GFC500 AP into the J, trying to figure out G5's vs GI 275's, what nav/comm's to switch to and all the other considerations with this upgrade.  I am curious if some of you who have already done this could share some of the installation costs you have incurred.  There are numerous good avionics shops around the midwest and I am seeing a large delta in quotes, and I feel not everyone wants to be working on Mooneys... Thanks in advance!