I got the GolfMk5, its fine as a windsurfing car, fold front seat down and I can easily throw my freestyle+waveboard in, plus 4 sails, booms etc. Bonus, it uses <5L/100km. Diesel, so pulls hard enough, great for overtaking on the highway.
Cons: Unreliable piece of crap. Mainly random electrical glitches. I got a manual to avoid any DSG issues. I suppose I may have to get roof racks at some stage if I want to cart gear and passengers... can still fit one person in the backseat behind the driver.
I bought it second hand, $10k, so I don't really give a crap, but I keep stuff in gear bags and a tarp in the back to avoid moisture issues.
I reckon next gear hauler, presuming I get overcome with stupidity, will be one of these
http://www.carsales.com.au/private/details/Mercedes-Benz-C63-2010/SSE-AD-2448564/?Cr=2&sdmvc=1 mmmmmmmm