They are all special in their own way. The Jet Commander because it was the first jet I ever flew. The Citation because it was the first (and only) jet I ever flew single pilot-- and it was so easy to fly!
However, I really, really like the Falcon 50. It is fun to fly, can do ANYTHING, is just a phenomenal airplane. I also have a real soft spot for the Learjet 35, because I flew them so much and really got to understand the airplane.
And, of course, the 980!