Just because you are big, shouldn't mean that you have to settle for a dog. I'm not saying the Tsunami is a dog, because I don't know.
Are you thinking poly, or composite? In any case, there are a lot of boats made to accomodate larger paddlers and some of them use the same hull as those that are made for average sized folks; they just raise the deck a little and maybe enlarge the cockpit.
Keep an open mind and do a lot of looking. Don't get humg up on one model, or one brand. I think there are design features that you should consider as much as how well you fit in a boat. Are you into rudders, skegs, or neither? What type of hatch systems do you prefer? Good looks and style can also be a big part of the deal.