I have a Jackson Fun (2004). I'm right smack dab in the middle of the weight range for it (6', 165 lbs), and it's my boat of choice for lots of fun class IV and a couple of V- runs here in Colorado. If you're just getting comfortable in class III you're in for an exciting time, but I would take it over a larger or creekier boat for what you're describing anytime.
Oh, and you have a place to stay on your next American whitewater tour if I can have a place to stay in Belgium -
Let us know how the trip goes!