If you really only wanted ONE board and your usage is blasting, fun slalom and/or a bit of fun course racing, a Hyper is the ONLY choice.
I keep one overseas with some sails so I can travel the region to events.
Its still competitive, fast and will get you through the lulls better than almost anything.
It easily takes 6.0 to 9.0 although mine is the 105.
I cant tell you to buy it because I dont know what your aims / usage is ?
At your weight and assuming you do a bit of light wind free sailing, a 2nd hand Free Formula may be a better idea ?