As other writers say, what you need to do is decide exactly what you want to do and then look for the right boat. I tow my boat and launch as Seaham Harbour. It is 15 foot and quite stable but slow, around 8 knots, but will run all day on 12 litres of fuel. I fish close inshore and restrict the steaming time to a maximum of 15 minutes straight out which is around 2 miles maximum. It is great with two people and easy single handed. 3 fishing is pretty good but 4 is a no-no. I would not recommend going out alone. I built the boat for under a grand but the safety gear, engine, trailer and electronics cost nearly 5K. It cost 50 quid a year to launch and a tenner for the boat club. The boat is easily trailed to Scotland and Whitby for a change of scenery. There is a picture on this site under Beejay. Hartlepool marina is 300 quid a year for a boat of similar size but the security is a bit iffy. If you want speed to get out there you need horses and horses cost money and need feeding. A 60hp engine takes around 6 gallon a day and you sacrifice some stability on the drift / anchor for the speed. Bigger boats get you out more often but cost more to moor, feed and maintain. Orkney day angler 19 or Arvor, Ocquteau, Riever Sportsman, etc all do good sea boats that would fulfill your requirements but the cost of moorings etc might be a bit daunting if money is tight. The cost of a decent boat only is relatively cheap but the engine, electronics and safety kit raise the price sharply. At the end of the day you need to decide how much you can afford in weekly running costs plus a bit for the odd breakage and replacement then see whats left for the overall boat package. Get a RNLI Seacheck before you go out; they are free but a donation to funds is more than welcome - you never know when you might need them.