I am looking to get my 1st kayak. I am a little on the short and heavy side 5' 9", 255 and I am concerned with stability. I also have bad knees and would like to be able to stand and fish without falling out. I have decided that a sit-on would be best, and looking for any recommendations. I don't mind paddling, but some kind of drive system would be nice if it can function in shallow, weedy areas. I am thinking a 12 footer should work. I would like to stay under 1k if possible and wouldn't be opposed to buying used. Any advice would be greatly appreciated. Thanks