Joco - it's hard to make such a suggestion, because I have no idea what it feels like to be your size. But I'll give it a try anyway...
I used to do my fly-fishing from a Wenonah Fisherman. 14'x39" (very) shallow arch hull. Very stable for standing for me, at 5'11" and 170lbs. They make a similar but larger boat, the Kingfisher, that would seem suitable for your needs - 16'x40". But I do not know if it translates to the difference in size between you and me. Worth a look though.
Oh - since I do more poling than paddling, one decent hull is almost as good as any other for standing...for me. That is one reason why when I dropped the Fisherman from my collection in favor of faster boats, I did not go with the Kingfisher. You, being significantly larger (with higher C of G), may not feel the same way.
Pull-Up Strap Handle Kit
2-3 Canoe/Kayak Trailer
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