If you're looking to get into the wakepark, don't bother with a crossover board. Sure, they work like the Tranq, Tona, Stomp, Gambler, but nothing will be close to as good as a proper park wakeboard.
Invest in a Hyperlite or Liquid Force wakeboard from 2013 onwards, no fins. You can practise all you air tricks at cable with no fins (harder than kiting), but the main thing will be to learn kickers and slider, which you can't use fins on. Cable parks are a heap of fun and a perfect match with kiting, although can get a little stale doing laps of a lake haha.
Here are some boards I would suggest for park riding.
http://www.liquidforce.com/wakeboards-raph.htmlwww.hyperlite.com/product-detail.php?id=wakeboards-unionwww.hyperlite.com/product-detail.php?id=wakeboards-wishbonewww.liquidforce.com/wakeboards-tao.htmlwww.liquidforce.com/wakeboards-peak.htmlAny of these from the last few years will suit you, and they are bombproof compared to most kiteboards so will last you forever!