My suggestion for a first turbine jet is a Rookie, a old favorite of mine.
I could be wrong, but something interesting that I observed this years is the people that learned to fly turbines in a bobcat, or a rookie, hotspots, etc.. ( the old "difficult to fly" jet trainers ) progressed smoothly to fast, big, complex models with ease, and tend to fly a lot more relaxed whatever they choose to fly.
And at the same time, people that learned to fly in boomerangs, and other "easy flying" jets had a tendency to fly easier, slower straight wing models even if they have plenty of experience.