You could also do well with a "diretional twin" deck. They usually have the flex pattern of a directional, but are twin shaped. Unless you are real close to 100% ability at switch (and most of us arn't), you really won't notice that much of difference when riding backwards. I'll put my standard plug in Never Summer decks (the SL
sounds like they would a good deck for you). Their decks tend to be a tad on the stiff side, so even the freestyle decks can handle speed. When speaking with NS reps, they told me that all of their boards can handle people in excess of 200lbs, so no need to worry about weight. 3-year warranty, too. Longest in the industry, and their boards are bullet proof. I've been riding for 20 years, and they make among the best boards I've ever seen.