Tim,
I'm only 6'2" and cough... 300 lbs give or take a full ounce... and I use a Hobie Outback..not cheap...but VERY stable..as I..well I should not reveal this..but...I am (not) much of a swimmer... But have no fears while in my yak..Picked it up at the place Eric....Nighthawk... has linked above..as a demo model..Never seen the water..but still shaved a good chunk off the price... They'll be happy to help you out..and prolly more than willing to allow you to try before you buy..or rent the one you think best suited to you for the day, Prior to you buying...
If you go into their site...You can click the Bargain Canoes or Yak's and they have an extensive list of used,rented,Blem. Etc.... Yaks with details and prices listed...that's how I found my outback..there are still several Hobie's listed..Hope you find the boat for you.
Ok upon checking they have listed (2)
Hobie Mirage Adventures
1 Sand Color the other Papaya
16' lenth
27.5 " Beam
450 Lb. Capacity
They both come with The Mirage Pedal Drive..Very nice..checkout the Hobie site for details..and Video of the "Tug O War"...Sold me on Hobie...and the need for the Mirage Drive system ...
Rudder,Seatback, and Paddle...
Both listed as new...and on sale for $1,499
Retail price is $1,699
This would be 4 ft longer than my boat...and Prolly that much more stable...There are many others listed...
One thing...I'd look to stay on the wider side in Beam width..For me..I was not willing to look at anything under 26in wide...but..then the wider you go the slower the boat is said to be...so thats something you'll have to judge for yourself...