First: reduce your budget by looking at older unused gear (like seasons 2007, 2008 and 2009). You can find very good gear (no real difference to 2010 models at your skill level) at half the price. There are also good deals on used equipment (but that then depends on your location)!
With your weight and conditions you are going to need a big sail, no less than 9 m2 to get planing reasonably often. And a matching board with at least 140 liter of volume, preferrably a little more, a width of some 80 cm.
Or then you should be looking at a modern longboard like Kona One or Starboard Phantom 320 that is meaningful to sail also in non-planing winds.