I think youre right- the stock prop should be a 4-blade OJ Legend, though I would guess 13x16 instead of 14x16.
Without knowing your current performance numbers, I would guess that the best prop for you would be an Acme 470 (12.5x15 3-blade). The Acme 1442 (13.25x15 3-blade) would also be a good choice if you can run it- but I know for sure it wont fit on the TSC1 Ski Nautique due to its larger diameter. If you have a 14x16 on there now, you can probably run the 1442. The Acme 422 (12.5x15.5 4-blade, currently the stock prop on all DD Nautiques) would be my next choice. The OJ XMP 428 should also get some consideration- it should turn performance numbers nearly matching the 422. OJ claims that it will offer a softer pull than the Acme- though I havent skied the OJ yet to confirm this.
Without knowing your current performance numbers, I would guess that the best prop for you would be an Acme 470 (12.5x15 3-blade). The Acme 1442 (13.25x15 3-blade) would also be a good choice if you can run it- but I know for sure it wont fit on the TSC1 Ski Nautique due to its larger diameter. If you have a 14x16 on there now, you can probably run the 1442. The Acme 422 (12.5x15.5 4-blade, currently the stock prop on all DD Nautiques) would be my next choice. The OJ XMP 428 should also get some consideration- it should turn performance numbers nearly matching the 422. OJ claims that it will offer a softer pull than the Acme- though I havent skied the OJ yet to confirm this.