I say you buy a slightly used boat in the states.
15000 will buy you a darn nice 16 to 18 foot aluminum.
I would look at crest liner, alumacraft, smokercraft... I have owned two crust liner fish hawks and I think they are nicely laid out with wide beams and good decking and storage.
Make sure you get a boat with a maxed out or close to it motor, as mentioned many times. And get a 24 v trolling motor too, as already mentioned.
Landry