The Legacy 600 has 3450 NM range. The older models claimed 3250 NM with reserves (but were actually better). I have filled the tanks and all the seats (legally) and made those #s without a problem. You have about 20,000-21,000 lbs of useful load (depending on BOW -- every airplane is different) and can carry around 18,500# of gas. That leaves 2000# to 2500# for people and stuff. The 650 has a higher MTOW and carries even more fuel and will have more useful load. Basically the 600 is gonna' go away because the 650 is a better airplane for not much more money.
And if your boss thinks leather seats and varnished hardwood looks like plastic I have to ask how a man so stupid can afford a jet at all. I found the Legacy interior superior to the vaunted Falcon for sure. The first couple "P" demonstrator interiors were not that good IMHO (too heavy, fit needed tweaking, etc.) but that was 150+ airplanes ago. Get with the program.
