A little jet ski history for you.
The original jet skis, early and mid 90s Sea Doo XPs, Yamaha Raiders and Ventures, Kawasaki Zxi and 750s(stand-ups and early sit-downs) were small and unstable, but fun, cheap and great for playing around close to shore.
In the mid 90s, we saw significant improvement in skis with the Yamaha GP, GPR and XLs, Sea Doo RX and XP Limited, and Kawasaki STX and Ultra. These skis started to get bigger and more powerful. For ultimate performance (at least bang for your buck) these are some of the best buying choices.