If I was in your shoes, I wouldn't go any bigger than the Carve 101 or Futura 101, especially since your primary focus is your 6.5 sail. For the range you're considering, I use a 2004 ML 8'3" Freeride that is 24" (61cm) wide and about 100 liters. It works beautifully with my 7.1 Hansen Freeride sail. Given the fact that I'm the same weight as you, I think you'll find the same kind of synergy with the 101 size, as it offers ample float in case the wind falls off and you need to slog in.
If pressed to choose between the Carve or the Futura, I would recommend the Futura, as it offers the blend from the best of the Carve and S-Type ranges. If you're going to look to 5 years of use, I think you would be happier in the long run with the latest and greatest. I know I would.