I have a 96 gsx, a 96 xp and a 2000 gtx. The wife loves the gtx, but it does use the fuel. The xp has a very small tank and if you ride like me, you will hit reserve in an hour. The gsx, is in my opinion, a great all around ski. Nice fuel capacity, great jumping, quick take offs, vts, and stay dry or get splashed. Easy to board when you take a dunk and keeps up with my wife's ski(she only runs half to 3/4 throttle). It's very agile and a breeze to maintain.
I would call it tippy if you have a bigger person on the back, but I'm 145 and it's stable with me only. I did dunk it a couple of times in destin last week, but the rider was a novice.
The gtx is a big ski. The larger the ski, the more fuel capacity and the more weight it can hold. See if you can find someone in your are to try out the smaller ski. Never know.