Which one...???

Hi everyone,

I am planning to buy a jetski in the near future and have done some research on the various brands. I'm basically down to only few, but still unsure which one to go for. I know the best way is to test and see what feels right for me, but planning to get through private sale - second hand so can't test ride.
Basically want a 2-3 seater, beginner friendly;
-kawasaki ZXI 900/1100
-kawasaki STX 900/1100
-seadoo XP (some reviews claim that it's pretty unstable..?)

Would really love some helpful tips,
Thanks heaps