CJ4 with the WT mod is a lot of fun. A great little jet to fly.
I agree with the other comment that the TBM is also a good step up on your way to a jet. It can max out at 610 km/h at 28,000 feet. Cruise is at about 470km/h.
I see them every now and then coming in on approach when the 23’s are active. When the 5’s are in use, they’re already too high or turned away before they fly over my area.
If you want a small jet, the Mario Noriega Caproni-Vizzola C22J Ventura is exactly that. It’s also VERY good and is dirt cheap - something around 10 bucks.