All depends on what your looking to do. If you want small and fast, the sp, spi, spx xp, and Kawi ss/xi, single rider ski's, unstable at low speeds. Gsi and GSX are good mid size. full size is gts, gtx,gts. Anything Seadoo with the carbed 951 engine is really good, but most engine are reliable if maintained. Uses reed valves instead of the rotory valve. Most anything yamaha. Wave jammer and Wave raiders are small single rider designs. Rated as 2, but really just 1. Wave runner 3 and VXR are good little skis. WR3 is a 650 and the vxr is a 701 I believe, Gp 760,1200 good mid size. If you want a big cruiser, the wave venture 1100 or 760. Kawi has the st, sts, and stx 750, stx 900 and 1100, all good 3 seater ski's. Kawi has the Zxi 750,900,1100. Good fast mid size, but single rider ski's.