Go with the XP if you can, 800/XP don't do anything great, but they do everything really good. Built like a brick. It is easy to go from the G4 to the 800 and back. Both are honest airplanes and the honeywell is simple. I always found travel time east to west about the same, nonstop at lrc or fast and a fuel stop. The trade off was less hobbs time and @ 400 gallons more fuel burn but plenty of reserves( sfo/mry/ unannounced fog etc..). @ 6 hours hobbs with hi speed, @ 7 hours lrc. Before anybody has a fit and starts throwing fire bombs at me, it has been a few years since I flew the 800 out west but we had crews try both and these are the numbers stuck in my head.