One thing you might want to consider is what your goals are (boarding, surfing, etc), what kind of water you are in, and different layouts. I love the x25 too but the x30 is a great boat too. I'm sure the x25 experts will be by soon about the ballast.
theres some x25 vs x30 talks here:
http://www.mastercraft.com/teamtalk/...&highlight=x25