What are you trying to achieve by upgrading the avionics in the XRS? It's a late one so it will be Batch 3 so there's not a busting lot that it can't do that the Vision can. It's not as pretty but it's just as functional. There's a few extra VNav modes on the Vision but who cares - everybody climbs in VS or pitch anyway because it's like being on one of those comedy bulls in a bar otherwise. Get the late XRS, change your username to blahdeblah51k, and spend the million odd bucks you would have spent on the "upgrades" on hookers and beer