Starting to do the same for my principal. Also throwing XLS and Sovereign into the pot. Read other threads, but thought I'd see if anyone has some good intel to add.
He's leaning toward the G150, we will be doing some legs of 2,000 nm (US) with usually no more than 4 passengers.
Runway performance of the Cessna products are hard to beat, but with the XLS on the longer trips will always be a fuel stop.
He doesn't like the internal baggage on the Hawker.
He's heard the G150 is a bit of a maint. pig. (I heard that about the G200, but not the 150).
If anyone has any tidbits, I'm all ears.
Thanks.