Any thought given to an Embraer Legacy 600 or 650? The 650 might be a bit out of range, but the 600 gets you a lot of airplane for the money. Looking at asking price (and we all know that NOBODY pays asking price anymore!), you can find them from 17 million US on down. It is a bit of a runway hog, and doesn't do 450, but man, the people in back paying the bills get a Gulfstream cabin for a Citation price. Thirteen passengers if you need the seats. Have a good friend that flies one, and yes, it lacks some goodies like auto throttles, but it is functional. He has almost perfect dispatch reliability, and the aircraft owner just loves the cabin and the baggage compartment. They looked at the 300, and an older 900EX, and decided that bang for the buck the Legacy took the prize for them.
All that being said, this is a great problem to have! Congratulations!