My brother-in-law owns the Ascend D10 sit on top. Its a nice kayak for the price. Fairly stable, wide, and with your weight would ride fairly high. It is NOT the nimblest kayak out there due to it's width and hull weight/shape. Also - make sure you get a long paddle for it... took my brother-in-law three trips and testing to get one that was long enough to be comfortable.
I've paddled it a few times... for the price you pay it is nice. You have lots of space to place accessories and it has a fairly high load value.
Take a look at the kayak thread they have stickied - it has a ton of good recommendations. In the end you decide what you can spend and get what will best meet your needs. Try and demo as much as possible if you can
I personally own an Ocean Kayak frenzy that i decked out a bit to fish from and love it - it has it's limitations as well (much lower weight limit) and as one of the other guys mentioned you get a lot more when you jump up the next teir price point (the $800'ish).