Im 270 and fish out of a Native Redfish 12. from what i have experienced, I like the 12 foot kayaks. They track well and seem to be a little faster than 10 footers. Seat height is also a consideration as the higher your center of balance the less stability you will have. You will have to learn to pack basic and light. You probably wont have room for all of your crappie gear and a backup rig for bass. the wind will blow you all over the place. In small creeks that won't be such an issue but on bigger water it will get aggrevating in a hurry. All said and done, you will probably love kayak fishing because it is peaceful, personal, and they can be very sneaky. A good amount of the fish I have caught out of mine were within 10 feet of the kayak and sometimes right under it.
Now that I have said all of that, I will go on to say that I haven't had the opportunity to fish out of one of the newer generation angling kayaks. These have a much different hull design and have integrated features that allow for more organized storage, attachments, and even the ability to stand and fish. My hangup with them is that 1500$ would buy me a decent little aluminum boat. Just my .02. Either way, have fun and be safe!