eyeskeenas,
The question is how many people will be fishing from it on a regular basis? If the answer is jusy you, then go a single kayak.
I had a Rosco 15 foot fibreglass canoe and everyone said that they would come fishing. This was the case for the first couple of months and then they all went quiet. So I ended up getting my first single kayak and have never looked back - I can go fishing any time I like and not have to rely on anyone else.
Have since bought a 2-person kayak for mates trips, which does get used a bit. But I still have my single yak for those days when I want some peace & quiet for myself.
Pete