You might be able to get a Silver Eagle turboprop. This is essentially a pressurised 210 with the Allison C20 engine. It won't do 300kts or even near that, though. But if you're willing to compromise on top speed to get turboprop it might be a good choice.
If you want blazing speed for not very much money and are willing to live with pistons, I'd get the last Piper Aerostar, the Machen-converted 702P. They'll smoke most turboprops with their 280kts max speed. Pressurised, long range, twin engine safety. Aerostars are also built with twice the thickness on the aluminium skins, so they're as sturdy as they come. There's never been an Aerostar structural failure.