Anything built in the last decade is likely to be 4 stroke, though there are some 2 stroke direct injections out there still.
I love my 2 stroke outboard. Super easy to maintain and reliable as hell, and fast. It is smoky though.
Those jet boats look fun, but you may need a longer tongue on the trailer they give you with them. They are hard as hell to back up with a big tow vehicle, like a jetski trailer.
Got a funny story about that. I was at TCD once launching my boat, and my brother in law was holding the boat at one ramp, standing on the pier in between it and the second ramp. Protecting the ramps on the outside of each were two long rock groins about 50 yards long. A foreign couple (some euro accent) pulls up to the other ramp with a seadoo jet boat being towed by a trailblazer. The woman gets in the boat, and the guy tries to back down, but he's having a hell of a time backing it with the terrible visibility, so he gets out and opens the tailgate so he can see better. Well they back it down to the water, as I am parking my own tow vehicle and walking back. As I am coming up, I see a set of HUGE rolling waves coming across the bay from a distant loaded tanker that had come up the ship channel. Well, they hit the dike, and get funneled up between the rock groins and come surging up the ramp. my brother in law manages to control my boat from the dock, but the poor lady is getting slammed on that jet boat because it's still winched to the trailer, but even worse, the guy had to back WAY down with that trailblazer because of the idiotically short trailer tongue on the trailer, each of a series of about 6 huge waves funnels in and washies right up and around and INTO the back of their vehicle, upt to the back of the driver's seat. The interior got flooded pretty good, and they were lucky it didn't get dragged back down the ramp into the water, but he kept his foot on the brake at least...
I felt bad for them, but it was funny as hell to watch.