With that sort of budget you'd be heading straight to the top shelf of the fishing kayak world. Stealth, kaskazi, pope canoes, paddleyak and other South African brands are on that shelf. Some of the better plastic/thermo boats like pelican and ocean kayaks require less care than glass and are still good boats. Your weight isn't an issue for a proper boat. It will be for the shorter generic types though. Hobbies are better for fishing with their pedal propulsion if fishing is the focus as it keeps the hands free to a large degree. Time to start test driving a few and working out what you like.