Thanks all for the replies.
The more we reviewed the specs, the 300 is clearly the winner over the two.... the 600lb payload with full tanks on the G200 is a bit pathetic and a bit of a deal breaker. Owner doesn't want to wait for a G250 - nor pay the price of something that new.
The question was asked about Hawaii. How would it be in a 300 going from LA area to Hawaii - possible with 6 people with a bunch of bags and scuba gear? They probably carry 5-700 pounds of bags when they travel just the 4-5 of them (again scuba gear - crap weighs a lot believe it or not). From what I read it looked like around a 1200lb payload with full fuel. 5 1/2 - 6 hour flight from VNY or LAX area, looks like it's pushing it with the 300 with a heavy load, and as mentioned, the lack of the IRS/IRU. They will also be going to London a few times a year. Done that trip too many times in a Learjet doing air ambulance... tired of stopping in Iceland and/or Goose/Gander
I started looking into the large cabin class - seen Kaiser Air is selling one of their G4's for 9.9mil. Prices sure are plumetting... the 5mil savings over a 300 pays for a lot of trips. And like mentioned so many times before - Bombardier vs Gulfstream support, no comparison. Can even get Falcon 2000 or 900 now for cheaper than a 300. It's too bad some owners are too fixated on the hourly operating cost, and burning 5000lbs that first hour just makes them shy away - even though they can more than afford it, I'm trying to convince them it's better than swimming.