Pending operational costs, if those weren't a concern...consider some of the larger aircraft? You were talking about the G150 and the LJ45; why not look at the LJ60 or the LJ45XR? If you're price point is $4M, define your operational costs. You're in a sector that's difficult at best, you either get a cheap jet that doesn't meet your range/pax requirements or you get an expensive jet that meets the criteria, but costs much more to operate. 4-6 people across the country is difficult to do inexpensively. There are a few listed Citation X's that are online, but they start at 4.8...if your boss is a good negotiator...let him loose, otherwise there is the Citation Ultra which has a decent range, cabin, etc...but I believe the Lear is slightly better on the performance side.