You need to look at the Malibu line of fishing kayaks. The X Factor and the Stealth 14 would handle you just fine.
You will have a dry ride, be able to carry as much gear as you like, as each has right at a 600 LB capacity.
I fish out of the X Factor as does my son. He is 6'4" and weighs 280#....was a college defensive lineman....
Here is a link you can gather info about them.... Malibu Kayaks, Fishing and Diving Kayaks, Sit-on-top Kayaks
Here is a pic of my yaks.....
Here is my son fishing out of his...