Free: Contests & Raffles.
For stability, 12-14' Zodiac/Achilles/Bombardier inflatable cannot be beat. I used to salmon fish out of Westport with my 13 footer. Second choice would be the same size Livingston or similar boat, we have two twelve footers. The center "seat" is only a hassle when trying to get used to running a tiller engine. The negative to the Livingston is that they are pretty much designed for the weight of a two-stroke hanging off the back and the four-strokes of the same horsepower cause them to sit substantially lower in the stern. The negative for the inflatables is that they can get leaks, and rockfish spines can cause pinholes.From my experience, there is no way a 'v' bottom boat can come close to the stability of either of the two styles listed. They have other positives though.Hope this helps.
I forgot about Whalers, though it seems like the cost is substantially higher. I'd still rather be seven miles off the coast in my 13' inflatable than a 13' Whaler though.