Congrats on your 17z. We're starting our 4th year with ours and love it. There's a few things you can do to increase your storage a bit. There's some mods on this forum that we've taken advantage of that work great!
We've taken out the false back under the sink, which really adds room for your cooking stuff. Also, cutting the divider board at the front bed, to open up access to the storage below, is great for storing light things, like clothes or extra blankets. Just beware of the wiring. You'll hear a lot of people worrying about overloading the trailer, with only about 300 lbs. of storage capacity(taking into account the battery, full water). While it's always good to be aware, we've never been able to come close.
We added this to the bathroom door and it works really well for small stuff:
http://www.jaycoowners.com/forums/f3...age-26054.html. Have fun!