I personally think any API-TC certified, low ash oil is fine, API-TC is all low ash. I've been using Quicksilver PWC, full synthetic oil for a couple of years, and I haven't had any problems, the RAVE valves have stayed exceptionally clean. I will admit that I use the Quicksilver because it's readily available (Walmart), and the price is right.
I would probably be using the SeaDoo XPS (which is made by Castrol), except the dealer here is across town and it's extremely expensive, more than twice what I've been buying the Quicksilver. That being said if you can get the XPS at a good price go with the XPS. I believe your boat has RAVE valves so you will want to use full synthetic.
Lou