There area LOT of decent tandem sit-on-tops to consider.
This one from Ocean Kayak (A good company) can be reconfigured to even allow one person (Seated in the middle)... http://www.dickssportinggoods.com/product/index.jsp?productId=12603268&cp=4406646.4413993.4417832.4417969
Some people will shun me for recommending this boat, but Pelican is making a comeback and actually making some decent boats now. I just picked up their Icon 120 and love it.
Read my comments on their comeback here: http://www.paddling.net/message/showThread.html?fid=chat&tid=1641698
Regardless, a sit-on-top might be just about perfect. You want a large cockpit, easy to get out of, it doesn't get any bigger! They are not expensive. Most track decently (not as well as a canoe, but decently enough).
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