Sounds like the H17 will fit your needs but there are other boats that will carry 350 lbs better. The F16 (Typan 4.9 or Blade) and the Hobie FX1 have been designed to be sailed both single and double handed however these boats are going to be more expensive. You might also consider the H16.

Your in the HCA Division 11 area which is a center for H17 racing. As a Division 11 H17 racer myself, I would love to see you get an H17 and come out and sail with us. If you get one and have any interest send me a private message here.