Seajet
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5 - 15k MIGHT buy you a serviceable small sailing boat capable of this trip, but would need someone experienced/qualified to give it a VERY thorough once over. And you afre unlikely to get much above the 25 - 27 foot mark for that money. A trip like that will take a fair toll on the equipment, and if its not up tos scratch you will bein bad troble very quickly. If you are looking at a Mobo, then forget it. Anything big enough and with good enough machinery to do that sort of trip will be selling for a LOT more. Would you buy an old banger of a car for a transcontinental trip? A car can stop roadside for repairs and spares. A boat can not, and engine failure at a critical moment can/will be fatal for both you and your boat, not to mention the dog! On the road, repair services are standing by. At sea, you may be asking rescuers to put their lives on the line to get you of trouble.
Agreed;
You might get away with using a cheap sailing boat, but only if you have the experience necessary; the years spent learning on boats have their own price, would you buy a cheap aeroplane and set off across the Atlantic ?!