Dan,
I have no real knowledge about the G1...
What I have experience in is operating in Europe.
You say you wanna move 4 to 7 guys.
Considering parking fees in Europe, airway/ATC fees, handling, hangarage, ETS (emission trade scheme) etcetc. I would say cldrvr has a good point in his KingAir remark.
If it is really not more than 7 blokes, a B200 could fit the bill IMO. Below 5,7tons you can stay out of ETS.
Almost every fee in Europe is based on max takeoff weight, so staying below 5,7 gives you a lot of flexibility and a way cheaper operation.
There are still B200s around you could charter before you decide. Which I would recommend to you anyhow: try the aircraft out before you buy it. At 100-200hrs, as pointed out, you will actually safe on chartering vs. operating yourself.
Sorry if all this info is not what you are looking for...