I'll play devils advocate and say don't stress so much about getting the perfect hull or perfect ski right away. You're not marrying it, if you find something that is somewhat mainstream and in good shape used you will see pretty minimal depreciation you can ride it and get to know it and what you like and don't like, you might find something else you like better, sell your ski and buy that. You'll be in a better position to recognize that it's better for you if you have something of your own as a baseline. You'll probably find yourself in more situations where you can try other skis if you have one of your own, more likely to go to events or hang out with people that do the type of riding that you are interested in. A guy with a flatwater ski is more likely to be okay letting you try his out if you are already doing flips or at least nosing in on your own ski. It also gives you way more opportunity to try out things and see what tuning does, try different pole lengths and different ride plates, nozzle angles, get a feel for how to tune a motor that is hotter than a superjet with a B pipe. The same hull can feel way different with changes to pole length, footholds, power delivery, nozzle angle, ride plate length and shimming. Having your own ski can let you get a feel for what you like, then you ride someone else and you might recognize the reason it feels super weird is that the pole is too long for you or some such, where if you had never ridden anything but a superjet it's probably going to feel super weird when you first try ANY flatwater ski.
$.02 from another perspective.