My parents have a '07 Seadoo Wake Edition, great for learning, especially kids or lighter people. It struggled with bigger people, drank more water, and it had an upgrade to add power. Worst part is if the driver is not very good it is speed up slow down speed up slow down. The other is once your up and boarding it seemed that I was always riding in the jet wash that seemed rough. I don't recall much of a wake, both my brother and I got boats so they have not boarded behind it since '09 when I was just beginning. They are fun to ride but I would rather a boat for boarding. I know when they were looking it seemed that new was the way to go. Used could have many issues if not properly taken care of. If you go new like the others mentioned you are half way to getting into a boat. They other is a boat is a lot more comfortable.
An option may be trying to find a partner to go in on a boat if you don't want to wait.