I'd go for the Lear 45 mate, much more versatile than the 60 for instance. The 60 is a great airplane to fly, lots of power but needs incredibly long runways. Forget those 4500 feet runways if it's rainy and/or the airport is above 2000 ft AMSL, no chance!
Of course use the APU, if not, too much moisture gets inside and you might have to pay a huge amount of money to repair it (even when using it you might go figure asking your boss to pay 20'000 bucks for a simple part to change!)
Have fun if you fly the Lear60, the Beast!